molecules Review Advances in Rosin-Based Chemicals: The Latest Recipes, Applications and Future Trends Szymon Kugler 1, * , Paula Ossowicz 1 , Kornelia Malarczyk-Matusiak 1 and Ewa Wierzbicka 2 1 2 * Faculty of Chemical Engineering, West Pomeranian University of Technology in Szczecin, Pulaskiego 10, 70-322 Szczecin, Poland; paula.ossowicz@zut.edu.pl (P.O.); kornelia.malarczyk@zut.edu.pl (K.M.-M.) Industrial Chemistry Research Institute, Rydygiera 8, 01-793 Warsaw, Poland; ewa.wierzbicka@ichp.pl Correspondence: skugler@zut.edu.pl Received: 22 March 2019; Accepted: 23 April 2019; Published: 26 April 2019 Abstract: A comprehensive review of the publications about rosin-based chemicals has been compiled. Rosin, or colophony, is a natural, abundant, cheap and non-toxic raw material which can be easily modified to obtain numerous useful products, which makes it an excellent subject of innovative research, attracting growing interest in recent years. The last extensive review in this research area was published in 2008, so the current article contains the most promising, repeatable achievements in synthesis of rosin-derived chemicals, published in scientific literature from 2008 to 2018. The first part of the review includes low/medium molecule weight compounds: Especially intermediates, resins, monomers, curing agents, surfactants, medications and biocides. The second part is about macromolecules: mainly elastomers, polymers for biomedical applications, coatings, adhesives, surfactants, sorbents, organosilicons and polysaccharides. In conclusion, a critical evaluation of the publications in terms of data completeness has been carried out with an indication of the most promising directions of rosin-based chemicals development. Keywords: rosin; curing agent; resin; surfactant; biocide; medicine; polymer 1. Introduction The natural origin, low price, abundance and chemical modification potential of rosin make it a valuable raw material in numerous applications [1–14]. Besides the mentioned advantages, rosin is also safe for living organisms [15]. Its derivatives are claimed as non-toxic as well, despite their allergenicity [16,17]. This unique set of beneficial properties of rosin determines it as an attractive subject of innovative research characterized by a considerably growing interest in recent decades, as can be seen in Figure 1. Unfortunately, the awareness of the possibility of using rosin as a raw material for obtaining valuable chemicals is generally unsatisfactory. There is a burning need to bring this topic to the attention of a larger group of scientists. Furthermore, the growing number of publications causes difficulties in keeping up with the latest research, as well as in selection of more promising discoveries. Sadly, the last comprehensive review document dedicated exclusively to rosin and its modifications was published in 2008 [1]. Since then, only fragmentary information on rosin has appeared in review articles on bio-based polymers and resin systems [2–21], as well as in reviews on rosin derivatives in catalysis [12], controlled drug-delivery systems [13] and small-molecule compounds [14]. In view of these facts, publication of a wide, comprehensive and critical review of achievements since 2008 is an important solution to solve the problem of a severe lack of current review literature in this field. The growing number of publications is not the only obstacle in creating a literature review on rosin. No less important challenge is to collect information from existing literature. Quite often Molecules 2019, 24, 1651; doi:10.3390/molecules24091651 www.mdpi.com/journal/molecules Molecules 2019, 24, 1651 Molecules 2019, 24, x FOR PEER REVIEW 2 of 52 2 of 51 articles do not contain full information about a particular reaction, but refer to earlier articles, which, not contain information particular reaction,online, but refer earlier in turn,often mayarticles refer todoeven earlierfull articles, whichabout mayanot be available ortomay notarticles, be in English. which, in turn, may refer to even earlier articles, which may not be available online, or may not be in The current article is a direct answer to the aforementioned issues. Its aims are: (I) to provide English. a precise review of the scientific literature from 2008 to 2018, (II) select promising studies with clear The current article is a direct answer to the aforementioned issues. Its aims are: (I) to provide a practicalprecise application and an overall assessment in with orderclear to identify review of the(III) scientific literature from 2008 of to the 2018,reviewed (II) select achievements promising studies the most perspective development directions of rosin-based chemicals. The review is identify presented in a practical application and (III) an overall assessment of the reviewed achievements in order to thepleasant-to-browse most perspective development directionswith of rosin-based Thereaction review is schemes. presented in a article modern, form, illustrated patientlychemicals. completed The modern, pleasant-to-browse form, illustrated with patiently completed reaction schemes. The article provides concise, but exhaustive information on the achievements in preparation of rosin-derived provides concise, but exhaustive information on the achievements in preparation of rosin-derived chemicals in the last decade. Its main idea is to inspire and encourage the world of science to actively chemicals in the last decade. Its main idea is to inspire and encourage the world of science to actively take interest in rosin and the possibilities of its modification. take interest in rosin and the possibilities of its modification. Figure 1. Number of scientific articlesand andpatent patent documents containing the keyword “rosin”“rosin” in the in the Figure 1. Number of scientific articles documents containing the keyword years 1990-2017. years 1990–2017. Basic Information about Rosin 2. Basic2.Information about Rosin or colophony, is a solid and brittle mixture of non-volatile conifer tree resin components. Rosin, Rosin, or colophony, is a solid and brittle mixture of non-volatile conifer tree resin components. It can display colors ranging from almost colorless, through shades of yellow and brown to black. It can display colors ranging from almost colorless, through shades of yellow and brown to black. Depending on the origin, two industrially important types of rosin can be distinguished, i.e. gum Depending two industrially ofremaining rosin canafter be distinguished, i.e., gum rosin rosinon andthe tallorigin, oil rosin. Gum rosin is theimportant non-volatiletypes residue distillation of tree resin and tallobtained oil rosin.byGum rosin is thetrees. non-volatile residue remaining after pulping distillation treeprocess. resin obtained tapping of living Tall oil rosin is a by-product of wood in theofkraft Gumofrosin accounts of world rosin production, whereas tall in oil the rosin is ca.process. 35%. In the by tapping living trees. for Tallca.oil60% rosin is a by-product of wood pulping kraft Gum rosin past, rosin was widely obtained from the solvent extraction of harvested wood as so-called wood accounts for ca. 60% of world rosin production, whereas tall oil rosin is ca. 35%. In the past, rosin was rosin, but nowadays, this technology is of little importance [1,22]. The price of rosin in the first half widely obtained from the solvent extraction of harvested wood as so-called wood rosin, but nowadays, of 2018 ranged from 300 to 2750 USD/ton depending on its origin, supplier and color. Annual world this technology is of little importance [1,22]. The price of rosin in the first half of 2018 ranged from 300 production of rosin is ca. 1.2 million tons and has remained stable in the last decades [1,2,22]. to 2750 USD/ton depending ongeneral its origin, supplier and color. Annual production rosin is ca. Resin acids, with the formula C19H29COOH, constitute up world to 95 wt.% of rosin, of while 1.2 million tons and has remained in the [1,2,22]. neutral compounds are present stable in amounts of alast fewdecades percent. A number of resin acids based on a few diterpene wereformula identifiedCso far29[1]. The most abundant acids are of built on while Resin acids,carbon with skeletons the general COOH, constitute upresin to 95 wt.% rosin, 19 H abietane and pimarane skeletons. Their structural formulas are shown in Figure 1. It should neutral compounds are present in amounts of a few percent. A number of resin acids basedbeon a few emphasized, that abietane-structured acids are characterized by conjugated double bond systems, diterpene carbon skeletons were identified so far [1]. The most abundant resin acids are built on abietane which makes them particularly susceptible to chemical modifications. It is noteworthy, that abietaneand pimarane skeletons. Their structural aretoshown in Figure 2. It should be emphasized, structured acids isomerize at elevated formulas temperature afford readily reactive levopimaric acid, that abietane-structured areother characterized by conjugated systems, according to Scheme acids 1. On the hand, pimarane-type acids do double not have bond conjugated doublewhich bond makes systems, which limits their chemical modifications. processability. The chemical of rosin acids them particularly susceptible to chemical It isdetailed noteworthy, thatcomposition abietane-structured depends on its type (gum, tall oil or wood), thermal history, species of tree and geographical isomerize at elevated temperature to afford readily reactive levopimaric acid, accordingorigin to Scheme 1. Compositions of gum rosin from various sources are presented in Table 1, where it can be On the [23,24]. other hand, pimarane-type acids do not have conjugated double bond systems, which limits their chemical processability. The detailed chemical composition of rosin depends on its type (gum, tall oil or wood), thermal history, species of tree and geographical origin [23,24]. Compositions of gum rosin from various sources are presented in Table 1, where it can be seen that the content of abietanetype acids may vary between 64 and 87 wt.%. Such detailed composition of a rosin can be determined, e.g., by the capillary electrophoresis method [25]. Molecules 2019, 24, x FOR PEER REVIEW 3 of 51 Molecules 1651 3 of 52 seen2019, that24,the content of abietane- type acids may vary between 64 and 87 wt.%. Such detailed composition of a rosin can be determined, eg. by the capillary electrophoresis method [25]. COOH COOH COOH A) Abietic acid B) Levopimaric acid C) Palustric acid COOH D) Neoabietic acid Molecules 2019, 24, x FOR PEER REVIEW 4 of 51 included in the schemes. There are situations where some data simply has not been reported by original authors, eg. product morphology or yield. Such missing data could not be presented in this review. What does the above mean? The more data provided, the more advancedCOOH the research on a COOH COOH COOH compound, and the more reliable the recipe. The lack of data should indicate that the research on a E) Dehydroabietic H) Pimaric acid F) Sandaracopimaric G) Isopimaric acid certain rosin derivative is probably at an early, basic stage. It has to be underlined that reaction acid acid schemes do not take into account advanced stereochemistry. Finally, almost all reactions were Figure 1. Structural thenitrogen most common abietane-structured (A–E) and Figure 2. Structural of theofmost common abietane-structured (A–E) and pimarane-structured conducted under an formulas inertformulas atmosphere: or argon, so reaction schemes do notpimaraneinclude this structured (F–H) resin acids. information. (F–H) resin acids. Table 1. Composition of resin acids in gum rosin from different sources [23]. Species Origin Pinus massoniana Pinus elliotti NH2 Pinus merkusii Pinus sylvestris DehydroPinus halepensis abietylamine China Brazil Indonesia Russia NH3 Greece >150°C France Portugal Pinus pinaster Spain O Cl P USA Cl Cl HOOC Abietane-type Acids Content (wt.%) Other Acids HOOCPalustric/Levopimaric Neoabietic Dehydroabietic (wt.%) Abietic Rosin 39 25 16 7 13 37 15 16 5 27 28 27 5 4 36 35 23 15 10 17 HOOC 45 23 13 5 14 Abietic acid 35 Ni 20 180°C 15 9 21 200°C 3h 34 21 19 9 17 26 22 27 6 19 O O 14 39 18 4 25 O HOOC Levopimaric acid Dehydroabietic acid O O OH for making films, coatings and In recent studies unmodified rosin was used adhesives [26–42], 65°C/3h O biomedical applications [43–55], or in mining, metallurgy and construction [56–58] and for filler 230°C, 3h O pTSA COOH purposes [59–64]. However, chemical modification of rosin gives many-fold greater possibilities of in CH3COOH using of this12h article. O=C this raw material, which are described in the next, main section 120°C, in CHCl3 HOOC Cl chloride 3.Dehydroabietyl Rosin-based Chemicals (yield 93%) HOOC Acrylpimaric acid yield: 73- 93% Maleopimaric acid yield: 92% 3.1. General Comments on the Whole Review Scheme Synthesis of essential essential rosin-based Scheme 1.1.Synthesis of rosin-basedsubstrates/intermediates. substrates/intermediates. The review contains short, but exhaustive descriptions of rosin-derived compound syntheses Table 1. Composition of resin acids in gum rosin from different sources [23]. 3.2. Small and Moleculeliterature Compounds published in Medium the scientific from the JCR list since 2008. It does not include older achievements in the field ofrosin-derived rosin, that were widely described in previous reviewwith literature and Abietane-type Acids Content (wt.%) This section describes small/medium molecule compounds strictly[1,65] defined Other Acids Species Origin commercialized It includes preparations of completely new chemicals, as well as new ways (wt.%) structures that do[66–80]. not contain the repeated units typical for macromolecules. Abietic Palustric/Levopimaric Neoabietic Dehydroabietic to synthesize already known compounds. Only products with declared or7 obvious practical Pinus massoniana China 39 25 16 13 applications into two 16sections according to the general 3.2.1. PinusIntermediates elliotti have been Brazilchosen. The 37 review is divided 15 5 27 Pinus merkusii Indonesia 28 compounds,27 5 is divided according 4 36 molecular structure of the prepared while each section to practical are the products of simple 23 rosin modifications, which are10necessary for17the PinusIntermediates sylvestris 35 15 application and theRussia structure similarity of the compounds. The collected data are given in the article Pinus halepensis 45 5 described ways 14 preparation of manyGreece new compounds. They can 23 be synthesized in13very simple, well text and in schemes. The following name, product France 35 information20are presented in 15the text: product 9 21 with high yields. The sustainability of these processes is high: They usually use a biobased main Portugal 21 19 applications.9 On the other hand, 17 morphology, substrates name(s), 34 separation techniques and practical Pinus pinaster substrate (rosin) in solvent-free processes. Some drawback can be 27 the separation processes, that19 may Spain 26 22 6 data such as reaction scheme, catalyst use, reaction media, temperature, pressure, time and yield are 14 high viscosity, 39 m.p. and stickiness 18 4 not always be easy, USA because of the of products. In view of25the above, rosin-based intermediates have very high commercialization potential and some of them are commercially available in certain regions of the world. In recent studies unmodified rosin was used for making films, coatings and adhesives [26–42], Maleopimaric acid is an off-white solid (m.p. 223 °C). It can be prepared from abietic acid and biomedical applications [43–55], or in mining, metallurgy and construction [56–58] and for filler maleic anhydride via a Diels-Alder reaction according to Scheme 1 [81], followed by recrystallization [82]. Maleopimaric acid is one of the crucial products in rosin chemistry. It can be used directly as an epoxy resin hardener, but its applications are much wider. They include preparation of epoxy resins [83,84], acrylic resins [85–87], allyl resins [88–90], polyols [91], bio-based curing agents for synthetic epoxy resins [92–98] or bio-based ones [99], surfactants [100–103], intermediates [104,105], biologically active compounds [105–108], polyurethanes [109-112], chemicals for NMR techniques [113] and photolitography [114], sorbents [115], organosilicon compounds [116], printing inks [117] Molecules 2019, 24, 1651 4 of 52 purposes [59–64]. However, chemical modification of rosin gives many-fold greater possibilities of using this raw material, which are described in the next, main section of this article. 3. Rosin-based Chemicals 3.1. General Comments on the Whole Review The review contains short, but exhaustive descriptions of rosin-derived compound syntheses published in the scientific literature from the JCR list since 2008. It does not include older achievements in the field of rosin, that were widely described in previous review literature [1,65] and commercialized [66–80]. It includes preparations of completely new chemicals, as well as new ways to synthesize already known compounds. Only products with declared or obvious practical applications have been chosen. The review is divided into two sections according to the general molecular structure of the prepared compounds, while each section is divided according to practical application and the structure similarity of the compounds. The collected data are given in the article text and in schemes. The following information are presented in the text: product name, product morphology, substrates name(s), separation techniques and practical applications. On the other hand, data such as reaction scheme, catalyst use, reaction media, temperature, pressure, time and yield are included in the schemes. There are situations where some data simply has not been reported by original authors, e.g., product morphology or yield. Such missing data could not be presented in this review. What does the above mean? The more data provided, the more advanced the research on a compound, and the more reliable the recipe. The lack of data should indicate that the research on a certain rosin derivative is probably at an early, basic stage. It has to be underlined that reaction schemes do not take into account advanced stereochemistry. Finally, almost all reactions were conducted under an inert atmosphere: nitrogen or argon, so reaction schemes do not include this information. 3.2. Small and Medium Molecule Compounds This section describes rosin-derived small/medium molecule compounds with strictly defined structures that do not contain the repeated units typical for macromolecules. 3.2.1. Intermediates Intermediates are the products of simple rosin modifications, which are necessary for the preparation of many new compounds. They can be synthesized in very simple, well described ways with high yields. The sustainability of these processes is high: They usually use a biobased main substrate (rosin) in solvent-free processes. Some drawback can be the separation processes, that may not always be easy, because of the high viscosity, m.p. and stickiness of products. In view of the above, rosin-based intermediates have very high commercialization potential and some of them are commercially available in certain regions of the world. Maleopimaric acid is an off-white solid (m.p. 223 ◦ C). It can be prepared from abietic acid and maleic anhydride via a Diels-Alder reaction according to Scheme 1 [81], followed by recrystallization [82]. Maleopimaric acid is one of the crucial products in rosin chemistry. It can be used directly as an epoxy resin hardener, but its applications are much wider. They include preparation of epoxy resins [83,84], acrylic resins [85–87], allyl resins [88–90], polyols [91], bio-based curing agents for synthetic epoxy resins [92–98] or bio-based ones [99], surfactants [100–103], intermediates [104,105], biologically active compounds [105–108], polyurethanes [109–112], chemicals for NMR techniques [113] and photolitography [114], sorbents [115], organosilicon compounds [116], printing inks [117] and for the hydrophobization of wood surfaces [118–120]. It is noteworthy that the main degradation products of maleopimaric acid are water, carbon dioxide, formamide and also aliphatic and aromatic derivatives [121]. It is worth noting that fumaropimaric acid is an isomer of hydrated maleopimaric acid, which can be synthesized in a similar way [122], but its importance to rosin chemistry is much smaller: it can be used in synthesis of triglycidyl epoxy resin [122] and water-borne polyurethanes [109]. Molecules 2019, 24, x FOR PEER REVIEW 5 of 51 derivatives [121]. It is worth noting that fumaropimaric acid is an isomer of hydrated maleopimaric acid, which be synthesized in a similar way [122], but its importance to rosin chemistry is much Molecules 2019, can 24, 1651 5 of 52 smaller: it can be used in synthesis of triglycidyl epoxy resin [122] and water-borne polyurethanes [109]. ◦ C). It can be prepared from abietic acid and acrylic Acrylpimaric off-white solid (m.p. 220220 Acrylpimaricacid acidisisanan off-white solid (m.p. °C). It can be prepared from abietic acid and acid according to Scheme 1, followed by precipitation, filtration,filtration, washing washing and recrystallization [123,124]. acrylic acid according to Scheme 1, followed by precipitation, and recrystallization It is noteworthy that neat that rosinneat canrosin be acrylated as well [125]. an important material in rosin [123,124]. It is noteworthy can be acrylated as wellAs [125]. As an important material in chemistry, acrylpimaric acid can be used for preparation of diallyl acrylpimarate [123], polyesters of rosin chemistry, acrylpimaric acid can be used for preparation of diallyl acrylpimarate [123], acrylated and polyethylene glycols [125], epoxy resins[125], [126,127], acrylpimaryl dichloride [128,129], polyestersrosin of acrylated rosin and polyethylene glycols epoxy resins [126,127], acrylpimaryl acrylpimaric acid amides [130], cyclic diamide ammonium salts [132–136], calcium dichloride [128,129], acrylpimaric acid amides[131], [130],quaternary cyclic diamide [131], quaternary ammonium and zinc salts [137] as well as polyesters [138]. Moreover, it can be used directly as an epoxy salts [132–136], calcium and zinc salts [137] as well as polyesters [138]. Moreover, it can becuring used agent [139]. directly as an epoxy curing agent [139]. Another is aa viscous, viscous, Another important important compound compound in in this this subsection subsection is is dehydroabietyl dehydroabietyl chloride. chloride. ItIt is yellow, oily liquid [140,141]. It can be prepared using: (i) oxalyl chloride according to Scheme 1 yellow, oily liquid [140,141]. It can be prepared using: (i) oxalyl chloride according to Scheme 1 prior prior to evaporation of unnecessary substances [142], phosphorustrichloride trichlorideinin chloroform chloroform (yield to evaporation of unnecessary substances [142], (ii)(ii) phosphorus (yield 92.5%) [140] or (iii) thionyl chloride in presence of 4-dimethylaminopyridine [143]. It can used 92.5%) [140] or (iii) thionyl chloride in presence of 4-dimethylaminopyridine [143]. It can bebe used as as a substrate for the synthesis of macroinitiators for atom transfer radical polymerization (ATRP) a substrate for the synthesis of macroinitiators for atom transfer radical polymerization (ATRP) reactions [142], rosin rosinphosphate phosphateesters esters [140], N-hydroxyethylacrylamide ester of dehydroabietic reactions [142], [140], N-hydroxyethylacrylamide ester of dehydroabietic acid acid [144], dehydroabietic ethyl methacrylate [145,146], dehydroabietic propargyl ester [147] [144], dehydroabietic ethyl methacrylate [145,146], dehydroabietic propargyl ester [147] dehydroabietic hexylacrylate acrylate [148], as well as intermediates other intermediates in synthesis various dehydroabietic hexyl [148], as well as other in synthesis of various of surfactants surfactants [143,149] and medicines [141,150,151]. [143,149] and medicines [141,150,151]. ◦ C). It is commercially Dehydroabietylamine, also known known as 44.5 °C). Dehydroabietylamine, also as leelamine, leelamine, is is aa solid solid (m.p. (m.p. 44.5 It is commercially available. Its application in antitumor therapies was investigated in recent years [152–155]. Moreover, available. Its application in antitumor therapies was investigated in recent years [152–155]. Moreover, it can be a substrate for preparation of epoxy resin [156], bio-based benzoxazines [157], quaternary it can be a substrate for preparation of epoxy resin [156], bio-based benzoxazines [157], quaternary ammonium surfactants [158,159], [158,159], acrylic acrylicmonomers: monomers:glycidyl glycidyl methacrylate monomer [160] or ammonium surfactants methacrylate monomer [160] or NN-dehydroabietic acrylamide [161]. dehydroabietic acrylamide [161]. 3.2.2. Resins and Monomers 3.2.2. Resins and Monomers Rosin-based resins and monomers are compounds which contain epoxy, acrylic, allyl, hydroxyl or Rosin-based resins and monomers are compounds which contain epoxy, acrylic, allyl, hydroxyl oxazine reactive groups, that enable cross-linking, polymerization or building in the polymer matrix. or oxazine reactive groups, that enable cross-linking, polymerization or building in the polymer Their preparations are usually well described and easy to perform. The syntheses are similar to matrix. Their preparations are usually well described and easy to perform. The syntheses are similar conventional resins/monomers preparations, however the necessity of using organic solvents in several to conventional resins/monomers preparations, however the necessity of using organic solvents in reactions is a disadvantage in the context of Green Chemistry rules. The high modification potential several reactions is a disadvantage in the context of Green Chemistry rules. The high modification of rosin derivatives allows one to prepare resins and monomers showing diverse and designable potential of rosin derivatives allows one to prepare resins and monomers showing diverse and properties. They can exhibit adjustable glass transition temperatures, low volume shrinkage, as well as designable properties. They can exhibit adjustable glass transition temperatures, low volume improve elastic modulus, Young’s modulus, shape-memory, flame retardancy, corrosion protection shrinkage, as well as improve elastic modulus, Young's modulus, shape-memory, flame retardancy, features of final casts/polymers in comparison with petroleum-based compounds. Therefore, the best corrosion protection features of final casts/polymers in comparison with petroleum-based described recipes show high commercialization potential in the segment of resins, adhesives and compounds. Therefore, the best described recipes show high commercialization potential in the paints, but in most cases, additional applied research should be performed to increase their technology segment of resins, adhesives and paints, but in most cases, additional applied research should be readiness level (TRL). performed to increase their technology readiness level (TRL). Triglycidyl ester of maleopimaric acid is a beige, viscous liquid. It can be prepared from Triglycidyl ester of maleopimaric acid is a beige, viscous liquid. It can be prepared from maleopimaric acid, epichlorohydrin and sodium hydroxide according to Scheme 2, followed by maleopimaric acid, epichlorohydrin and sodium hydroxide according to Scheme 2, followed by filtration, washing and evaporation [83]. It can be used in liquid epoxy resins [83], non-cytotoxic filtration, washing and evaporation [83]. It can be used in liquid epoxy resins [83], non-cytotoxic biobio-based epoxypolyurethanes [162] as well as synthesis of rosin-based cyclic carbonates [132]. Similar based epoxypolyurethanes [162] as well as synthesis of rosin-based cyclic carbonates [132]. Similar liquid resin can be synthesized from fumaropimaric acid [122]. liquid resin can be synthesized from fumaropimaric acid [122]. O Maleopimaric acid 1. O O COOH Cl O O O 2. NaOH O O TBA Br in H2O 70-130°C, 10h O COO O O Scheme 2. Synthesis of triglycidyl ester of maleopimaric acid. Maleopimaric acid triglycidyl ester yield: 75% Molecules 2019, 24, xx FOR PEER REVIEW Molecules 2019, 24,24, FOR PEER REVIEW Molecules 2019, x FOR PEER REVIEW Molecules 2019, 24, 1651 66 of 51 6of of5151 6 of 52 Scheme 2. Synthesis of triglycidyl ester of maleopimaric acid. Scheme 2. 2. Synthesis ofof triglycidyl ester ofof maleopimaric acid. Scheme Synthesis triglycidyl ester maleopimaric acid. yellowish liquid. Diglycidyl can bebeprepared prepared isisa ayellowish yellowish liquid. ItItItcan can be prepared from acrylpimaric acid, Diglycidylacrylpimarate acrylpimarateis yellowishliquid. liquid.It canbe preparedfrom fromacrylpimaric acrylpimaricacid, acid, and filtration, epichlorohydrin sodium hydroxide according to Scheme 3, prior to filtration, washing epichlorohydrinand and sodium hydroxide according to Scheme 3, prior tofiltration, filtration,washing washingand and drying can be used in materials showing improved thermal, mechanical and [126]. It can be used in epoxy materials showing improved thermal, mechanical and drying [126]. It It can bebe used ininepoxy epoxy materials showing improved thermal, mechanical and shapedrying[126]. [126].It can used epoxy materials showing improved thermal, mechanical andshapeshapememory properties [126]. shape-memory properties memory properties [126]. memory properties [126].[126]. COOH COOH COOH Acrylpimaric acid Acrylpimaric acid Acrylpimaric acid 2. N 2. 2. N aOH aOH N aOH TEBAC TEBAC TEBAC 115-60°C, 5h 115-60°C, 5h5h 115-60°C, COOH COOH COOH COO COO COO Cl Cl O 1. 1. 1. Cl O O O OO Diglycidyl Diglycidyl acrylpimarate acrylpimarate acrylpimarate yield: yield:88% 88% Diglycidyl O O O yield: 88% COO COO COO Scheme 3. 3. Synthesis of diglycidyl acrylpimarate. Synthesis ofof diglycidyl Scheme 3. acrylpimarate. Scheme Synthesis diglycidyl acrylpimarate. Another diglycidyl derivative of acrylpimaric acid and its siloxane modification modification can be prepared Another diglycidyl derivative ofof acrylpimaric acid and itsits siloxane can bebe prepared Another diglycidyl derivative acrylpimaric acid and siloxane modification can prepared according to Scheme 4, prior to washing, filtration and vacuum evaporation [127]. Prepared epoxy washing, according toto washing, filtration and vacuum evaporation accordingtotoScheme Scheme4,4,prior priorto washing,filtration filtrationand andvacuum vacuumevaporation evaporation[127]. [127].Prepared Preparedepoxy epoxy resins can improve the thermal stability and flame retardancy of products [127]. the thermal stability and flame retardancy of products [127]. resins can improve the thermal stability and flame retardancy of products [127]. resins can improve the thermal stability and flame retardancy of products [127]. COOH COOH COOH O OO O OO O OO O OO (C ))33N 22H (C(C H255H N 5)3N 110°C 110°C 110°C COOH COOH COOH O OO O OO O OO O OO O OO COO COO COO Acrylpimaric Acrylpimaric Acrylpimaric acid acid acid OH OHOH OCH CH3 CH 3 3 OCH CHCH 3 3 3 3 CH 3 3 OCH CH CH 3 CHCH 3 3 H CO Si O Si O Si O) ( ) ( ) ( H33H CO Si O Si O Si ( ) ( ) ( m k CO Si O ( 3 m)m( Si Ok)k( SiO )On n)n Ph OCH Ph 3 PhPh OCH 3 3 PhPh OCH TPT TPT TPT 120°C 120°C 120°C ORO CH ORO 3 3 CHCH CHCH ORO CH 3 3 3 3 ORO Si O Si O Si O ) RO ( ) ( ) ( ORO Si O Si ( Si( SiO )Om ( ) ( ORO k Si O Si ) ( ) ( mm k k O )On n)RO nRO ORO Ph ORO PhPh PhPh ORO Ph O OO HO HOHO COO COO COO Ethylene glycol diglycidyl Ethylene glycol diglycidyl Ethylene glycol diglycidyl ether modified acrylpimaric acid ether modified acrylpimaric acid ether modified acrylpimaric acid (AP-EDGE) (AP-EDGE) (AP-EDGE) Siloxane modified AP-EDGE Siloxane modified AP-EDGE Siloxane modified AP-EDGE yield: 81-89% yield: 81-89% COO yield: 81-89% COO COO R R= = R= O OO O OO O OO O OO O OO O OO COO COO COO EEW (experimental EEW (experimental EEW (experimental value) (g/mol) = 481, value) (g/mol) == 481, value) (g/mol) 481, 645, 714, 952, 645, 714, 952, 1190 645, 714, 952,1190 1190 Scheme 4. Preparation of ethylene glycol diglycidyl ether modified acrylpimaric acid and its siloxane Scheme 4.4. Preparation ofethylene ethylene glycol diglycidyl ether modified acrylpimaric acid and its 4. Preparation ofof ethylene glycol diglycidyl ether modified acrylpimaric acid and itsits siloxane Scheme Preparation glycol diglycidyl ether modified acrylpimaric acid and siloxane derivative. siloxane derivative. derivative. derivative. Dimaleopimaryl yellow solid. from levopimaric acid Dimaleopimaryl brownish prepared Dimaleopimaryl ketone isisaaa abrownish brownish yellow solid. It Itcan can bebeprepared prepared from levopimaric acid Dimaleopimarylketone ketoneis brownishyellow yellowsolid. solid.It canbe preparedfrom fromlevopimaric levopimaricacid acid and maleic anhydride according to Scheme 5, prior to washing and recrystallization [163]. It can be washing and maleic anhydride according to Scheme 5, prior to washing and recrystallization [163]. It can and maleic anhydride according to Scheme 5, prior to washing and recrystallization [163]. It canbebe used directly as an epoxy resin hardener, as well as for the synthesis of bio-based epoxy resins, i.e., well for bio-based used asas well asas for the synthesis ofof bio-based epoxy resins, i.e. useddirectly directlyasasananepoxy epoxyresin resinhardener, hardener,as wellas forthe thesynthesis synthesisof bio-basedepoxy epoxyresins, resins,i.e. i.e. tetraglycidyl dimaleopimaryl ketone, according to Scheme 5 [163]. according to Scheme 5 [163]. tetraglycidyl dimaleopimaryl ketone, according to Scheme 5 [163]. tetraglycidyl dimaleopimaryl ketone, according to Scheme 5 [163]. O OO O OO O OO pTSA pTSA pTSA in in toluene toluene in toluene 135-230°C 135-230°C 135-230°C 5h 5h 5h COOH COOH COOH Levopimaric Levopimaric Levopimaric acid acid acid O OO O O OO OO O OO O OO zinc acetate zinc acetate zinc acetate in 33COOH in CH CHCH COOH in 3COOH ?°C, 12h ?°C, 12h12h O ?°C, O O OO O OO 1. NaOH 1. 1. NaOH NaOH Cl Cl O 2. 2. 2. Cl O O O OO zinc acetate zinc acetate zinc acetate in ?°C, 6h in DMF, DMF, ?°C, 6h 6h in DMF, ?°C, O Dipimaryl ketone Dipimaryl ketone Dipimaryl ketone yield: 97% yield: 97% yield: 97% O OO O OO O OO O OO O OO Dimaleopimaryl ketone Dimaleopimaryl ketone Dimaleopimaryl ketone yield: 85% yield: 85% yield: 85% O OO O OO O OO O OO O OO O OO O O O Tetraglycidyl Tetraglycidyl Tetraglycidyl dimaleopimaryl ketone dimaleopimaryl ketone dimaleopimaryl ketone Scheme 5. Synthesis of tetraglycidyl dimaleopimaryl ketone. Scheme 5. 5. Synthesis of tetraglycidyl dimaleopimaryl ketone. Scheme Synthesis tetraglycidyl dimaleopimaryl ketone. Scheme 5. Synthesis ofof tetraglycidyl dimaleopimaryl ketone. Molecules 2019, 24, 1651 7 of 52 Molecules2019, 2019,24, 24,xxFOR FORPEER PEERREVIEW REVIEW Molecules of 51 51 77 of Rosin It can be prepared from epoxidized rosin, water, potassium Rosinpentaglycidyl pentaglycidylether etheris isaaasolid. solid. It It can can be be prepared prepared from from epoxidized epoxidized rosin, rosin, water, potassium potassium Rosin pentaglycidyl ether is solid. water, hydroxide and epichlorohydrin according to Scheme 6, and using such separation methods as vacuum hydroxide and epichlorohydrin according to Scheme 6, and using such separation methods as hydroxide and epichlorohydrin according to Scheme 6, and using such separation methods as drying, filtration, precipitation and washing [164]. It can be used as a component in epoxy resin vacuum drying, drying, filtration, filtration, precipitation precipitation and and washing washing [164]. [164]. ItIt can can be be used used as as aa component component in in epoxy epoxy vacuum systems showing high glass transition temperature as wellasaswell elastic modulus [164]. [164]. resin systems showing high glass transition temperature as elastic modulus resin systems showing high glass transition temperature as well as elastic modulus [164]. 3-chloro3-chloroperoxybenzoic peroxybenzoic acid acid in CH Cl2 in CH22Cl 2 0°C, 6-8h 0°C, 6-8h Rosin Rosin O O HH22OO O O OH OH OH OH OHaq aq inCC2HH5OH in 2 5 90°C, 36h 36h 90°C, COOH COOH COOH COOH 2. 2. Cl Cl O O O O O O O O CC O O Rosin Rosin pentaglycidyl pentaglycidyl ether ether Hydroxylated rosin rosin Hydroxylated O O O O O O O O O O O O Cl inCH CH2Cl in 2 22 80°C, 7h 7h 80°C, COOH COOH Epoxidized rosin rosin Epoxidized O O 1. KOH KOH 1. OH OH OH OH Scheme 6. Synthesis of of rosin pentaglycidyl ether. Scheme 6. 6. Synthesis of rosin rosin pentaglycidyl pentaglycidyl ether. ether. Scheme Polygral is solid byproduct of the paper and forestry forestry industry, containing rosin acids and their Polygral is is aaa solid solid byproduct byproduct of of the the paper paper and forestry industry, industry, containing containing rosin rosin acids acids and and their their Polygral oligomers [165]. It can be epoxidized to prepare bio-based epoxy resins. Endocyclic epoxidized oligomers [165]. [165]. It can be be epoxidized epoxidized to to prepare prepare bio-based bio-based epoxy epoxy resins. resins. Endocyclic Endocyclic epoxidized epoxidized oligomers polygral is a solid, which can be prepared using 3-chloroperoxybenzoic acid, according polygral is red brown solid, which can be prepared using 3-chloroperoxybenzoic acid, according to polygral is a red brown solid, which can be prepared using 3-chloroperoxybenzoic acid, according to to Scheme 7, prior to vacuum evaporation. On the other hand, exocyclic epoxidized polygral is a Scheme 7, prior to vacuum evaporation. On the other hand, exocyclic epoxidized polygral is a viscous Scheme 7, prior to vacuum evaporation. On the other hand, exocyclic epoxidized polygral is a viscous 0 -diisopropyl viscous red brown liquid, that can be prepared in two ways, using oxalyl chloride or N,N red brown brown liquid, liquid, that that can can be be prepared prepared in in two two ways, ways, using using oxalyl oxalyl chloride chloride or N,N′-diisopropyl N,N′-diisopropyl red carbodiimide before addition of glycidol, according to Scheme 7 prior to washing and vacuum drying. carbodiimide before addition of glycidol, according to Scheme 7 prior to washing and vacuum vacuum carbodiimide before addition of glycidol, according to Scheme 7 prior to washing and They can be used for preparing bisphenol A-free epoxy resins [165]. drying. They They can can be be used used for for preparing preparing bisphenol bisphenol A-free A-free epoxy epoxy resins resins [165]. [165]. drying. COOH COOH 3-chloro3-chloroperoxybenzoic O peroxybenzoic O acid acid HOOC HOOC O inCH CH2Cl Cl O in 2 22 -5°C, 10h 10h -5°C, O O Endocyclic Endocyclic epoxidized epoxidized polygral polygral O O 1.NN CC NN 1. HOOC HOOC 2. 2. O OH O OH O O O CC O pTSA/DMAP pTSA/DMAP in CH CH2Cl Cl in 2 22 0°C, 72h 72h 0°C, COOH COOH Polygral Polygral (C2HH5))3NN (C 2 5 3 in toluene in toluene 20°C, 24h 24h 20°C, Cl Cl O O O O Cl Cl COO COO O O Cl Cl O CC O COCl COCl O O OH OH Exocyclic Exocyclic epoxidized epoxidized polygral polygral (C2HH5))3NN (C 2 5 3 intoluene toluene in 0°C, ?h ?h 0°C, Scheme 7. 7. Preparation Preparation of of epoxidized epoxidized rosin rosin oligomers. oligomers. Scheme Diglycidyl is can be be Diglycidyl dehydroabietylamine dehydroabietylamine is is aaa yellowish yellowish sticky sticky liquid. liquid. ItIt can be synthesized synthesized from from Diglycidyl dehydroabietylamine yellowish sticky liquid. synthesized from dehydroabietylamine, epichlorohydrin and sodium hydroxide according to Scheme 8, prior to filtration, dehydroabietylamine, epichlorohydrin and sodium hydroxide according to Scheme 8, prior to dehydroabietylamine, epichlorohydrin and sodium hydroxide according to Scheme 8, prior to washing, drying and vacuum distillation [156]. It can be applied in epoxy resins exhibiting better filtration, washing, drying and vacuum distillation [156]. It can be applied in epoxy resins exhibiting filtration, washing, drying and vacuum distillation [156]. It can be applied in epoxy resins exhibiting thermal stabilitystability and higher transition temperatures than petroleum-based products [156]. better thermal thermal stability andglass higher glass transition transition temperatures than petroleum-based petroleum-based products better and higher glass temperatures than products Rosin maleimidodicarboxylic acid diglycidyl ether is a yellowish solid. It can be prepared from [156]. [156]. epichlorohydrin and dicarboxylic derivative of maleimide (described in more detail in Section 3.2.3) Rosin maleimidodicarboxylic acid diglycidyl ether is a yellowish solid. It can be prepared from Rosin maleimidodicarboxylic acid diglycidyl ether is a yellowish solid. It can be prepared from according to Scheme prior to filtration, washing, drying and(described rotary evaporation It in shows higher epichlorohydrin and9dicarboxylic dicarboxylic derivative of maleimide maleimide (described in more more[84]. detail in subsection subsection epichlorohydrin and derivative of in detail glass transition temperature, modulus and thermal stability than its plant oil counterparts [84]. 3.2.3) according to Scheme 9 prior to filtration, washing, drying and rotary evaporation [84]. It shows 3.2.3) according to Scheme 9 prior to filtration, washing, drying and rotary evaporation [84]. It shows higherglass glasstransition transitiontemperature, temperature,modulus modulusand andthermal thermalstability stabilitythan thanits itsplant plantoil oilcounterparts counterparts[84]. [84]. higher 1. Cl O 2. NaOH Dehydroabietylamine O H2O ; TBA Br 45°C, 153h Molecules 2019, 24, 1651 Molecules Molecules 2019, 2019, 24, 24, xx FOR FOR PEER PEER REVIEW REVIEW NH2 Cl Cl N Diglycidyl 8 of 52 88 of dehydroabietylamine of 51 51 yield: 90% O O O 1.diglycidyl Scheme 8. Synthesis of1. dehydroabietylamine. 2. 2. NaOH NaOH O Dehydroabietylamine O Dehydroabietylamine O H2N O NH NH22 COOH O O O COOH H Br H22O O ;; TBA TBA Br 45°C, 45°C, 153h 153h N N N O Diglycidyl Diglycidyl dehydroabietylamine dehydroabietylamine COO N yield: yield: 90% 90% O O O Cl O Scheme 8. 8. Synthesis Scheme dehydroabietylamine. Synthesis of of diglycidyl diglycidyl dehydroabietylamine. in DMF COO 160°C, 4h COOH O O O O O O O MaleopimaricO acid NaH in DMF 150°C, 5h H H22N N Rosin-maleimidodicarboxylic O O diglycidyl ether acid yield: 47% COOH COOH COOH N N Rosin-maleimidodicarboxylic acid O O yield: 87% COOH COOH Cl Cl O O COO COO N N O O O O O O Scheme acidCOO diglycidylOether. in DMF9. Preparation of rosin maleimidodicarboxylic NaH in DMF 160°C, 160°C, 4h 4h NaH in in DMF DMF 150°C, 150°C, 5h 5h trimethylolpropane O COO Rosin-maleimidodicarboxylic Rosin-maleimidodicarboxylic COOH COOH acid ether Triester of maleopimaric acid and is a dark yellow solid. can be prepared acidItdiglycidyl diglycidyl ether COOH COOH yield: yield: 47% 47%of according to Scheme 10, prior to washing and vacuum distillation [98]. It can be used in synthesis Maleopimaric Maleopimaric Rosin-maleimidodicarboxylic acid Rosin-maleimidodicarboxylic acid rosin-based epoxy resin [98]. acid acid yield: yield: 87% 87% Epoxy resin having EEW = 199.68 g/eq based on maleopimaric acid and trimethylolpropane ester 9. of rosin maleimidodicarboxylic diglycidyl ether. 9. Preparation acid diglycidyl ether. Scheme Preparation of 10, rosin maleimidodicarboxylic ether. [98]. It can be can be preparedScheme according to Scheme prior to extraction andacid vacuum distillation used directly as an epoxy compound, or transformed into acrylate resin [98]. Triester maleopimaric acid is Triester of maleopimaric yellow It Triester ofresin maleopimaric acid and and trimethylolpropane trimethylolpropane is aa dark dark yellow yellow solid. solid. It can can be be prepared prepared Acrylateof based on epoxidized maleopimaric-trimethylolpropane adduct according to Scheme 10, prior to washing and vacuum distillation [98]. can be used in synthesis of It according to Scheme 10, priorIttocan washing distillationby [98]. It can methacrylated be used in synthesis of 10 [98]. be usedand as avacuum resin crosslinked styrene, eugenol [98]. rosin-based epoxy resin [98]. rosin-based epoxy resin [98]. or methacrylated guaiacol [98]. Epoxy Epoxy resin resin having having EEW EEW == 199.68 199.68 g/eq g/eq based based on on maleopimaric maleopimaric acid acid and and trimethylolpropane trimethylolpropane ester ester HO OH can be prepared according to Scheme 10, prior to extraction and vacuum distillation [98]. It can O OH Crosslinked resinbe can be prepared according to Scheme 10, prior to extraction and vacuum distillation [98]. It can be O used or transformed into acrylate resin [98]. styrene used directly directly as as an an epoxy epoxy compound, compound, or transformed into acrylate resin [98]. OH OH O or methacrylated eugenol Acrylate on maleopimaric-trimethylolpropane adduct can Acrylate resin resin based based on epoxidized epoxidized maleopimaric-trimethylolpropane adductguaiacol can be be prepared prepared or methacrylated pTSA OH O according to Scheme 10 [98]. It can be used as a resin crosslinked by styrene, methacrylated xylene It can be used O as a resin crosslinked by styrene, methacrylated eugenol according to Scheme 10in [98]. eugenol O O O OH or O or methacrylated methacrylated guaiacol guaiacol [98]. [98]. COOH O O O O Maleopimaric acid O O O O COOH COOH O O O Maleopimaric Maleopimaric O acid acid O O O O O O O O O HO 1. K OH/ HO OH NaOH HO OH Cl O 2. OH OH OH OH OH OH pTSA pTSA in DMSO OH OH in <24°C,18h in xylene xylene 1. K 1. O K OH/ OH/ NaOH NaOH O Cl Cl O O 2. 2. O O O O COO O O O O O O OH OH OH Maleopimaric acid trimethylolpropane ester OH OH 93% O yield: styrene styrene HO or or methacrylated methacrylated eugenol eugenol O or methacrylated guaiacol or methacrylated guaiacol OH O COO COO OH OH O O O O O HO HO O O O O O in in DMSO DMSO <24°C,18h <24°C,18h O O Crosslinked resin Crosslinked resin O OH O O O O HO OH Maleopimaric Maleopimaric acid acid O O O trimethylolpropane ester PPh3 O trimethylolpropane ester O O Maleopimaric acid O O O HQ yield: 93% O O yield: 93% trimethylolpropane-based 85°C, 3.5h O O Oepoxy resin yield: O 85% OH OH O O O O O O O O O O O O O O O HO HO HO OH O O O O O O HO HO O O O O O O O O O O O O O Maleopimaric acid O trimethylolpropane-based O OH epoxy acrylate resin yield: 95% OH O O O O O O O O O HO O O Scheme 10. Preparation of maleopimaric acid-trimethylolpropane ester-based epoxy acrylate acrylate resin HO O Preparation of maleopimaric acid-trimethylolpropane ester-based epoxy OScheme 10. resin O O OH OH O O crosslinked by by unsaturated unsaturated monomers. monomers. crosslinked O O O O O O O PPh O 33 PPh Maleopimaric acid Maleopimaric acid O Maleopimaric acid O Epoxy maleopimaric acid and trimethylolpropane ester O Maleopimaric acid O resin having EEW = 199.68 g/eq based onHQ HQ trimethylolpropane-based trimethylolpropane-based trimethylolpropane-based 3.5h 85°C, 3.5h can be prepared according to Scheme 10, prior to85°C, extraction and vacuumtrimethylolpropane-based distillation [98]. It can be epoxy epoxy epoxy resin resin yield: yield: 85% 85% epoxy acrylate acrylate resin resin yield: yield: 95% 95% used directly as an epoxy compound, or transformed into acrylate resin [98]. Scheme Scheme 10. 10. Preparation Preparation of of maleopimaric maleopimaric acid-trimethylolpropane acid-trimethylolpropane ester-based ester-based epoxy epoxy acrylate acrylate resin resin crosslinked crosslinked by by unsaturated unsaturated monomers. monomers. Molecules 2019, 24, 1651 9 of 52 Acrylate resin based on epoxidized maleopimaric-trimethylolpropane adduct can be prepared according to Scheme 10 [98]. It can be used as a resin crosslinked by styrene, methacrylated eugenol or Molecules 2019, 24, guaiacol x FOR PEER REVIEW 9 of 51 methacrylated [98]. Dehydroabietic ethyl methacrylate is a white powder. It can be prepared from dehydroabietyl chloride and hydroxyethyl methacrylate according to Scheme 11, prior to neutralization, drying, O evaporation and chromatography [146]. It can be widely used as 2a)2Omonomer in preparation of graft HO(CH O(CH 2)2OH and block copolymers [146,166–170]. It is worth noting, that a similar O compound dehydroabietic ethyl acrylate hydroxyethyl and (CH3)from pyridine liquid, which can be prepared 3N O(CH2)2Ois a yellow, viscous O(CHacrylate 2)2O COCl CHfiltration, in CH 2Cl2 2Cl2 O O dehydroabietyl chloride priorinto precipitation and vacuum distillation [171]. for O O It can be used 50°C, 4h Dehydroabietyl 0-25°C, 48h Dehydroabietic Dehydroabietic preparation of homopolymer with no declared application [171]. Moreover, rosin ethyl acrylate can be chloride ethylinacrylate ethyl methacrylate used preparation bio-based Molecules 2019, 24, x FORof PEER REVIEWgraft copolymers of chitosan for controlled release applications9[172]. of 51 Scheme 11. Synthesis of dehydroabietic ethyl acrylates. Cl HO(CH2)2O O O O HO(CH2)6OH O(CH2)2OH pyridine O(CH 2)2O Molecules 2019, 24, xDMAP FOR PEER REVIEW O O in THF Dehydroabietic 50°C, 12h COCl ethyl acrylate Dehydroabietyl chloride in CH2Cl2 50°C, 4h (CH3)3N (CH3)3N HQ in CH2Cl2 in THF 0-25°C, 48h 25°C, 10h HO COCl O O(CH2)2O 9 of 51 OO Dehydroabietyl Dehydroabietic O O chloride ethyl methacrylate O Dehydroabietic O O Hydroxyhexyl HO(CH2)2O dehydroabietate yield: 72% hexyl acrylate yield: 41% O(CH ) OH Scheme 11. Synthesis of dehydroabietic ethyl acrylates. 2 2 O Scheme 11. Synthesis of dehydroabietic ethyl acrylates. O (CH3)3acrylate. N pyridine Scheme 12. Synthesis of dehydroabietic hexyl O(CH ) O O(CH ) O 2 2 2 2 Cl Dehydroabietic hexyl acrylate It can be synthesized chloride, in CH2Cl2is a solid. COCl in CH2Cl2from dehydroabietyl O O O O 50°C, 4h Dehydroabietyl 0-25°C, 48h separationDehydroabietic hexanediol and acryloyl chloride according to Scheme 12, and using methods such as Dehydroabietic Dehydroabietic ethyl methacrylate is a white powder. It Ocan be prepared from dehydroabietyl chloride HO(CH2)6OH ethyl acrylate ethyl methacrylate filtration, precipitation, washing and vacuum drying [148]. Its application is a soft acrylic monomer (CH3)3N11, prior to neutralization, drying, chloride and hydroxyethyl methacrylate according to Scheme ◦ C), whichHO DMAP (glass transition temperature of −23 can impart a flexibility to the integrated polymer [148]. HQ Scheme 11. Synthesis dehydroabietic ethyl evaporation and chromatography [146]. It canofbe widely used as aacrylates. monomer in preparation of O graft in THF in THF O and block [146,166–170]. ItOis worth noting, that25°C, a similar 50°C, 12h 10h compound dehydroabietic ethyl COCl copolymers O Cl acrylate is a yellow, viscous liquid, which can be prepared from hydroxyethyl acrylate and Dehydroabietyl O Hydroxyhexyl O Dehydroabietic O chloride dehydroabietyl chloride prior to filtration, precipitation and vacuum distillation [171]. It can be41% used dehydroabietate yield: 72% hexyl acrylate yield: HO(CH2)6OH (CH3)3N[171]. Moreover, rosin ethyl acrylate for preparation of homopolymer with no declared application HO DMAP Scheme 12. Synthesis of dehydroabietic HQhexyl acrylate. O can be used in preparation of bio-based graft copolymers in THF in THF of chitosan for controlled release O 50°C, 12h 25°C, 10h O COCl [172]. applications Dehydroabietic ethyl methacrylate is a white powder. It can be preparedO from dehydroabietyl Dehydroabietyl OisHydroxyhexyl O Dehydroabieticchloride, Dehydroabietic hexyl acrylate a solid. It can to be Scheme synthesized from to dehydroabietyl chloride and hydroxyethyl methacrylate according 11, prior neutralization, drying, chloride dehydroabietate yield: 72% hexyl acrylate yield: 41% hexanediol and acryloyl chloride according to Scheme 12, and using separation methods such as evaporation and chromatography [146]. It can be widely used as a monomer in preparation of graft filtration, precipitation, washing and vacuum drying [148]. Its application is a soft acrylic monomer Scheme 12. Synthesis of dehydroabietic hexyl acrylate. and block copolymers [146,166–170]. It is worth that a similar compound dehydroabietic ethyl Scheme 12. Synthesis of noting, dehydroabietic hexyl acrylate. (glass transition temperature of −23 °C), which a flexibility to the integrated polymer acrylate is a yellow, viscous liquid, which can canimpart be prepared from hydroxyethyl acrylate[148]. and Dehydroabietic ethyl methacrylate is a white powder. It can be prepared from dehydroabietyl N-hydroxyethylacrylamide ester ester of of dehydroabietic dehydroabietic acid is a viscous, yellow liquid. be N-hydroxyethylacrylamide viscous, liquid. It can dehydroabietyl chloride prior to filtration, precipitation and vacuum distillation [171]. It can be used chloridefrom and hydroxyethyl methacrylate according to Scheme 11, prior toaccording neutralization, drying,13, prepared dehydroabietyl chloride and N-hydroxyethylacrylamide according to Scheme Scheme 13, N-hydroxyethylacrylamide to for preparation of homopolymer with no declared application [171]. Moreover, rosin ethyl acrylate evaporation andwashing, chromatography [146]. It canchromatography be widely used as[144]. a[144]. monomer inbe preparation of graft in prior to drying and column It It can be used as as a monomer to filtration, filtration, washing, drying and column chromatography can a monomer can be used in preparation of bio-based graft copolymers of chitosan forused controlled release and block copolymers [146,166–170]. It is worth noting, that a similar compound dehydroabietic thermoset system with soybean oil-based resin forfor coating andand adhesive applications [144]. in thermoset system with soybean oil-based resin coating adhesive applications [144].ethyl applications [172]. acrylate is a yellow, viscous liquid, which can be prepared from hydroxyethyl acrylate and Dehydroabietic hexylprior acrylate is a Osolid. It can beand synthesized from dehydroabietyl chloride, dehydroabietyl chloride to filtration, precipitation vacuum distillation [171]. It can be used hexanediol and acryloyl chloride with according to Scheme 12, and using separation methods such as forDehydroabietyl preparation of homopolymer no declared application [171]. Moreover, rosin ethyl acrylate Dehydroabietic acid NH filtration, washingofand vacuum drying [148]. Its application a soft acrylic ester monomer chloride can be precipitation, used in preparation bio-based graft copolymers of chitosanisfor controlled release N-hydroxyethylacrylamide (glass transition temperature of −23 °C), which can impart a flexibility to the integrated polymer [148]. purity: 90%, yield: 80% applications [172]. OH N-hydroxyethylacrylamide esteris of dehydroabietic acid is a viscous, yellow liquid.chloride, It can be Dehydroabietic hexyl acrylate a solid. It can be synthesized from dehydroabietyl N O H and using separation Etaccording 3N prepared from dehydroabietyl chloride and toN-hydroxyethylacrylamide according to Scheme hexanediol and acryloyl chloride Scheme 12, methods such as13, C O COCl in CH2Cl2 ; 45°C/4h O filtration, precipitation, washing and vacuum drying [148]. Its application is a soft acrylic monomer prior to filtration, washing, drying and column chromatography [144]. It can be used as a monomer transition temperature of −23 °C), which can for impart a flexibility to the integrated polymer in (glass thermoset system with soybean resin coating and of adhesive applications [144].[148]. Scheme 13. Synthesis ofoil-based N-hydroxyethylacrylamide ester dehydroabietic acid. Synthesis N-hydroxyethylacrylamide ester of dehydroabietic acid is a viscous, yellow liquid. It can be prepared from high dehydroabietyl chlorideO and N-hydroxyethylacrylamide according 13, Rosin-based high adhesion polyurethane polyurethane acrylate is is aa faint-yellow It can cantobe synthesized Rosin-based adhesion acrylate faint-yellow solid. solid. It beScheme synthesized Dehydroabietyl Dehydroabietic acid prior to filtration, washing, drying and column chromatography [144]. It can be used as a monomer from hydrogenated rosin, and 2-hydroxyethyl acrylate according to Scheme 14, from hydrogenated rosin,isophorone isophoronediisocyanate diisocyanate and 2-hydroxyethyl acrylate according to Scheme NH chloride in thermoset system with soybean oil-based resin for coating andN-hydroxyethylacrylamide adhesive applications [144].ester 14, prior to precipitation, vacuum drying and column chromatography [173]. Its80% application is an purity: 90%, yield: adhesive having a high polymerizationOHrate, low volume shrinkage and high adhesion [173]. O Dehydroabietyl chlorideCOCl Et3N NH in CH2Cl2 ; 45°C/4h O C O N H O Dehydroabietic acid N-hydroxyethylacrylamide ester purity: 90%, yield: 80% Molecules 2019, 24, x FOR PEER REVIEW Molecules 2019, 24, 1651 NCO 10 of 51 10 of 52 O Rosin-based high adhesion O O NCOand column chromatography [173]. Its application prior to precipitation, vacuum drying is an adhesive polyurethane O dibutyltin dilaurate having a highNCO polymerization rate, low volume shrinkage and high adhesion [173]. acrylate Molecules 2019, 24, x FORp-methoxyphenol PEER REVIEW 10 of 51 O HN Isophorone NH 40°C diisocyanate O NCO O O NCO O Rosin-based O COOH O O HO HO high adhesion O O NCO O O NCO MgCl2 in butyl acetate N N polyurethane O O O H NCO dibutyltin dilaurate dibutyltin dilaurate NCO O O O acrylate p-methoxyphenol O p-methoxyphenol O HN O Isophorone HN O 75-100°C NH NH 40°C O N diisocyanate H O O O HO COOH COOH O O O O Scheme 14. Synthesis of rosin-based high adhesion MgCl in butyl acetatepolyurethane acrylate. 2 2 O O N N N N H H dibutyltin dilaurate p-methoxyphenol O O monomers are viscous 75-100°C O O O O O O Rosin-based glycidyl methacrylate liquids: brown rosin acid-glycidyl O O O O Nprepared methacrylate and colorless dehydroabietylamine-glycidyl methacrylate. They can be N from H H glycidyl methacrylate and rosin or dehydroabietylamine according to Scheme 15, prior to the use of Scheme 14. polyurethane acrylate. 14. Synthesis of rosin-based highand adhesion polyurethane acrylate. such separation Scheme techniques as washing, extraction evaporation [160,174]. They significantly improve thermal and mechanical properties of soybean oil-based thermosets [160]. Moreover, they Rosin-based glycidyl methacrylate monomers are viscous liquids: brown rosin acid-glycidyl Rosin-based glycidyl methacrylate monomers are viscous liquids: brown rosin acid-glycidyl can be used in copolymerization with other acrylate monomers [175], or as an advanced tackifier in methacrylate and dehydroabietylamine-glycidyl methacrylate. They can be prepared from methacrylate and colorless colorless dehydroabietylamine-glycidyl the UV-crosslinking pressure sensitive adhesives [174,176].methacrylate. They can be prepared from glycidyl methacrylate and rosin or dehydroabietylamine accordingtotoScheme Scheme prior glycidyl methacrylate and rosin or dehydroabietylamine according 15,15, prior to to thethe useuse of of such separation techniques as washing, extraction and evaporation [160,174]. They significantly such separation techniques as washing, extraction and evaporation [160,174]. They significantly O improve thermal mechanical properties ofof soybean oil-based thermosets [160]. Moreover, theythey can O improveCOOH thermaland and mechanical properties soybean oil-based thermosets [160]. Moreover, O O HO O be in copolymerization withwith other acrylate monomers [175], or asoran tackifier in the canused be used in copolymerization other acrylate monomers [175], asadvanced an advanced tackifier in O O UV-crosslinking pressure sensitive adhesives [174,176]. the UV-crosslinking pressure sensitive adhesives [174,176]. NH2 N OH TBA Br in MEK COOH COOH <80°C, 24h O O O Rosin acid O O Rosin acid-glycidyl OH OH methacrylate monomer TBA Br yield: 95% in MEK O O O O O O in MEK <80°C, 24h Rosin acid O O O NH NH22 Dehydroabietylamine HO O O O O O HO HO in ethanol 40-80°C, 60h O N N O Dehydroabietylamine-glycidyl O HO HO methacrylate monomer O O O O O yield: 89% O O O in ethanol Rosin acid-glycidyl Scheme 15. Synthesis of rosin-based glycidyl methacrylate monomers. 40-80°C, 60h O O methacrylate monomer Dehydroyield: 95% Ethylene glycol maleic rosinate (meth)acrylate can be preparedDehydroabietylamine-glycidyl from maleated rosin, ethylene abietylamine methacrylate monomer glycol and (meth)acrylic acid according to Scheme 16 [85]. It can be applied in styrene-acrylate yield: 89% copolymers increasing their thermal stability [86], as well as in preparation of moleculary imprinted Scheme 15. Synthesis rosin-based methacrylate monomers.[85,87]. polymers for stationary phases used inof chromatography Scheme 15. Synthesis ofhigh-performance rosin-based glycidyl glycidylliquid methacrylate monomers. Diallyl acrylpimarate is a yellow liquid [123]. It can be prepared from acrylpimaric acid and an Ethylene glycol maleic rosinate (meth)acrylate can be prepared from maleated rosin, ethylene ethylene maleic rosinate (meth)acrylate can be from maleated rosin, allyl Ethylene halide byglycol different methods, according to Scheme 17,prepared and using separation methods such as glycol and (meth)acrylic acid according to Scheme 16 [85]. It can be applied in styrene-acrylate glycol andwashing, (meth)acrylic acid according to Scheme 16 [85]. It filtration, extraction and evaporation [88,123,177]. It can can be be applied applied in asstyrene-acrylate a monomer in copolymers increasingresins their thermal thermal stabilityresources [86], as as well well as or in in preparation ofaminated moleculary imprinted copolymers increasing their stability [86], as in preparation of moleculary imprinted polyester unsaturated from renewable [123], synthesis of curing agent polymers for stationary phases used in high-performance liquid chromatography [85,87]. polymers stationary phases used in high-performance liquid chromatography [85,87]. for epoxy for [178]. Diallyl acrylpimarate is a yellow liquid [123]. It can be prepared from acrylpimaric acid and an allyl halide by different to Scheme 17, and using separation methods such as O methods, according O O HO R filtration, washing, extraction and evaporation [88,123,177]. It can be applied O R as a monomer in O O O polyester unsaturated resins from renewable resources [123], or in synthesis of aminated curing agent Ethylene glycol O O maleic rosinate for epoxy [178]. O O (meth)acrylate ZnO O O R O HOOC 200-220°C, 3h O Maleic rosin O O O HO O HO O R R O O O O O O O R O O R R O O O O O acrylate. O Scheme 16. Preparation Preparation of ethylene ethylene glycol glycol maleic rosinate of O O O O HOOC HOOC Maleic rosin ZnO 200-220°C, 3h O O O O O O R R O O O O O O R R Scheme 16. Preparation of ethylene glycol maleic rosinate acrylate. R = H- or CH3- Ethylene glycol maleic rosinate (meth)acrylate R R= = HH- or or CH CH33-- Molecules 2019, 24, 1651 11 of 52 Molecules 2019, 24, x FOR PEER REVIEW 11 of 51 Diallyl acrylpimarate is a yellow liquid [123]. It can be prepared from acrylpimaric acid and an allyl halide by different methods, according to Schemesolid. 17, and using methods such Aminated diallyl acrylpimarate is a yellow-brown It can be separation synthesized from diallyl as filtration, washing, extraction and evaporation [88,123,177]. It can applied as a monomer in acrylpimarate and cysteamine hydrochloride according to Scheme 17,be prior to washing, extraction Molecules 2019, 24, x FOR PEER REVIEW 11 of 51 polyester unsaturated resins from renewable resources [123], or in synthesis of aminated curing agent and evaporation [178]. It can be applied as a resin or a curing agent for epoxy resins, giving them for epoxy [178]. improved thermal and acrylpimarate shape-memoryisproperties [178]. solid. It can be synthesized from diallyl Aminated diallyl a yellow-brown acrylpimarate and cysteamine hydrochloride according to Scheme 17, prior to washing, extraction COOH COO and evaporation [178]. It can be applied asCla resin or a curing agent for epoxy resins, giving them NH2 COO HS HDMA Cl improved thermal and shape-memory properties [178]. COONa COOH in DMF <60°C, <2h microwaves 700W Cl NaOH in ethanol 25°C, 1h DMAP in dioxane+ethanol UV 36W, 4h COO HS HDMA Cl in DMF Br <60°C, <2h K2CO 3 microwaves 700W in acetone COONa 70°C, 12h COONa COOH NaOH COO NH2 COO S S COO DMAP in dioxane+ethanol Aminated di-allyl UV 36W, 4h acrylpimarate Acrylpimaricin ethanol Sodium Di-allyl H2N acid 25°C, 1h yield: 58% NH2 S acrylpimarate acrylpimarate COO S COOH Br yield: 100% yield: 85-92% COO Aminated di-allyl K2CO3 Acrylpimaric acrylpimarate Scheme 17. 17. Synthesis of diallyl acrylpimarate acrylpimarate and its its aminated aminated derivative. derivative. Sodium Di-allyland H2N Scheme diallyl in acetone acid COONa yield: 58% NH2 70°C, 12h acrylpimarate acrylpimarate 100%acrylpimarate yield: 85-92% Aminated diallyl a yellow-brown solid.from It can be synthesized diallyl Sodiumyield: maleopimarate is a solid,iswhich can be prepared maleopimaric acid from according to acrylpimarate and cysteamine hydrochloride according to Scheme 17, prior to washing, extraction and Scheme 18 prior to drying at 40 °C [89]. Its applications include the synthesis of triallyl Scheme 17. Synthesis of diallyl acrylpimarate and its aminated derivative. evaporation [178]. It can be applied as a resin or a curing agent for epoxy resins, giving them improved maleopimarate. thermal and shape-memory Sodium maleopimarateproperties is a solid, [178]. which can be prepared from maleopimaric acid according to O O O Sodium maleopimarate a solid, which prepared from maleopimaric acid according to Scheme 18 prior to dryingis at 40 °C [89].can Itsbeapplications include the synthesis of triallyl Cl O O Na ◦ Scheme 18 prior to drying at 40 C [89]. Its applications include the synthesis of triallyl maleopimarate. maleopimarate. O O O NaOH 25°C, 1h O COOH Maleopimaric acid O O O in H2O NaOH in H2O 25°C, 1h O Na O Na Sodium maleopimarate O Na yield 100% O COO Na HDMA Cl in DMF, microwaves <60°C, <3.5h or: Cl Br HDMA Cl Kin DMF, microwaves 2CO 3 p-benzoquinone <60°C, <3.5h in acetone or: 70°C, 12h O O C=O O O O Tri-allyl O maleopimarate yield: 91-93% O Br COO Na Sodiumof triallyl maleopimarate. Scheme 18. Synthesis K CO p-benzoquinone C=O Tri-allyl O 2 3 maleopimarate Maleopimaric acid maleopimarate in acetone yield 100% yield:agents 91-93%for 70°C, 12h for use as nucleating In a similar way dehydroabietic acid salts can be synthesized isotactic polypropylene in aScheme non-isothermal crystallization process, improving the crystallization 18. Synthesis Scheme 18. Synthesis of of triallyl triallyl maleopimarate. maleopimarate. temperature and accelerating the nucleation rate [179,180]. Triallyl maleopimarate is a white viscous liquid, canway be prepared from sodium maleopimarate and allylfor halide according to Scheme 18, In which a similar dehydroabietic acid salts can be synthesized use as nucleating agents for prior to extraction, washing, filtration and vacuum distillation [88,89].improving It can be used as a monomer non-isothermal crystallization crystallization isotactic polypropylene in a non-isothermal crystallization process, the crystallization in UV-cured polymer films and coatings, giving them improved adhesion and mechanical properties temperature and accelerating the nucleation rate [179,180]. Triallyl maleopimarate is a white viscous [89], aswhich well as in be thermally cured bio-based resin systems exhibiting can prepared maleopimarate and allyl halide satisfactory according tothermal Schemeand 18, liquid, fromfully sodium mechanical properties [88]. prior to extraction, washing, filtration and vacuum distillation [88,89]. It can be used as a monomer to extraction, washing, filtration and vacuum distillation [88,89]. It can be used as a monomer in Mono-allyl rosin derivatives have been also synthesized inadhesion recent Allyl rosinate can be in UV-cured polymer films coatings, giving them improved and mechanical properties UV-cured polymer films andand coatings, giving them improved adhesion andyears. mechanical properties [89], prepared [181] orcured ethanol [182] medium from rosin, exhibiting sodium hydroxide and thermal allyl chloride [89], as well asthermally in thermally fully bio-based resin systems exhibiting satisfactory thermal as well asininaqueous cured fully bio-based resin systems satisfactory and according to Scheme 19, prior to filtration and distillation [181]. It can be potentially applied as an mechanical properties [88]. unsaturated monomer in copolymerization reactions [181] as well as in UV-cured resins [182]. On the recent years. years. Allyl rosinate can be Mono-allyl rosin derivatives have been also synthesized in recent other hand, allyl maleopimarate can be prepared in THF acid, oxalyl chloride and prepared in aqueous [181] or ethanol [182] medium fromfrom rosin,maleopimaric sodium hydroxide and allyl chloride allyl alcohol according to Scheme 19, and using such separation methods as vacuum distillation distillation [181]. It can be potentially applied asand according to Scheme 19, prior to filtration and distillation an column chromatography [90]. It can be usedreactions in unsaturated and resins as a [182]. cross-linking copolymerization reactions [181] as asresins well as UV-cured resins [182]. unsaturated monomer in copolymerization [181] well in epoxy UV-cured resins On the agenthand, [90]. allyl maleopimarate can be prepared in THF from maleopimaric acid, oxalyl chloride and other COOH allyl alcohol according to Scheme 19, and using such separation methods as vacuum distillation and chromatography [90]. [90]. It can be used in unsaturated resins and epoxy resins as a cross-linking column chromatography agent [90]. Molecules 2019, 24, x FOR PEER REVIEW 12 of 51 O O O O O Na OH Rosin O O Molecules 2019, 24, x FOR PEER REVIEW Cl Molecules 2019, 24, x FOR PEER REVIEW NaOH O HDMA Cl O in H2O O in H2O O 25°C, 1h O Na microwaves <700W OH 0.5h Cl O<65°C, Na OH Sodium NaOH rosinate Cl yield 92% HDMA Cl 1. O Molecules 2019, 24, 1651 O Cl Cl O O O O O O O Allyl rosinate yield 95% OH O(C H Cl 2 5)3 1. O Cl p-benzoquinone Cl in THF O 1. O O OH O OO Maleopimaric acid 2. 12 of 52 12 of 51 12 of 51 2. O O O O O 50-25°C, 16h Cl O OH O O OO OO Allyl maleopimarate 2. (C H ) 2 5 3 OH in H2O yield 62% HDMA Cl p-benzoquinone OH O (C 2H5)3 microwaves 2 in H2O<700W in THF p-benzoquinone <65°C, 0.5h OH Scheme 19. Synthesis of mono-allyl rosin derivatives. O 25°C, 1h O 50-25°C, 16h Allyl rosinate microwaves <700W O in THF Sodium rosinate <65°C, 0.5h yield 95% MaleopimaricO 50-25°C, 16hmaleopimarate Allyl rosinate Allyl O inNaOH H2O 25°C, in H O1h Rosin yield 92% Sodium Rosin Benzoxazines arerosinate compounds yield consisting acid group with an oxazine yieldmoiety. 62% 95% of a bicyclic Maleopimaric Allyl maleopimarate yield 92% Maleopimaric acid imidophenol is a white, crystal solid. It can be synthesized from maleopimaric acid yield 62% Scheme 19.Synthesis Synthesis of mono-allyl rosin derivatives. mono-allyl acid and 4-aminobenzoicScheme phenol19. according toofScheme 20, rosin priorderivatives. to precipitation and drying [96]. It 19. Synthesis of mono-allyl can be used in synthesis ofScheme benzoxazine monomers [96]. rosin derivatives. Benzoxazines are compounds consisting of a bicyclic group with anmoiety. oxazine moiety. Benzoxazines are compounds consisting of a bicyclic with an oxazine Maleopimaric Rosin-based benzoxazine monomers are orangegroup solids. They can be synthesized from Maleopimaric acid imidophenol is a white, crystal solid. It can be synthesized from maleopimaric Benzoxazinesis are compounds of abebicyclic groupfrom withmaleopimaric an oxazine moiety. acid imidophenol a white, crystal consisting solid. It can synthesized acid20, and maleopimaric acid, paraformaldehyde and aniline or 4-aminobenzoic acid, according to Scheme acid and 4-aminobenzoic phenol according to Scheme 20, prior to precipitation and drying [96]. It Maleopimaric acid imidophenol is a white, crystal solid. It can be synthesized from maleopimaric 4-aminobenzoic phenol according to Scheme 20, prior to precipitation and drying [96]. can be used prior to filtration, washing and rotary evaporation [96]. They can be polymerized into It products of can be used in synthesis ofphenol benzoxazine monomers [96]. 20, prior to precipitation and drying [96]. It acid and 4-aminobenzoic according to Scheme in significant synthesis of benzoxazine monomers [96]. thermal benzoxazine stability [96]. monomers are orange solids. They can be synthesized from can beRosin-based used in synthesis of benzoxazine monomers [96]. maleopimaric acid, paraformaldehyde and aniline or 4-aminobenzoic acid, according to Schemefrom 20, Rosin-based benzoxazine monomers are orange solids. They can be synthesized OH O O O prior to filtration, washing and rotary evaporation [96]. They can be polymerized into products maleopimaric acid, paraformaldehyde and aniline or 4-aminobenzoic acid, according to Scheme of 20, 1. H2N significant thermal stability and [96].rotary evaporation O O of prior to filtration, washing [96]. TheyRcan be polymerized into products N 2. (CH2O)n significant thermal [96]. H2N stabilityOH N O O O O O O COOH H O2N Maleopimaric H2N acid COOH in DMF 160°C, 4h O in DMF 120°C, 5h OH OH in DMF 160°C, 4h in DMF 160°C, 4h OH O OH O 1. H2N N O N O 2. (CH2O)n 1. H2N OO R COOH R Maleopimaric acid in DMF 2. (CHimidophenol 2O)n COOH 120°C, 5h yield: 88% in DMF 120°C, 5h R=H O or COOH N R N O Rosin-based NO benzoxazine or COOH N O yield: 76-81% O N COOH COOH R=H R R = H or COOH Rosin-based Maleopimaric acid R COOH Scheme acid imidophenoland anditsitsbenzoxazines. benzoxazines. Scheme20. 20.Synthesis Synthesisof ofmaleopimaric maleopimaric acid imidophenol benzoxazine COOH imidophenol Maleopimaric Rosin-based Maleopimaric acid yield: 76-81% yield: 88% acid benzoxazine COOHsolids. imidophenol Maleopimaric Rosin-based benzoxazine monomers are orange They be synthesized from maleopimaric Dehydroabietylamine-guaiacol (brown powder, m.p. 104can °C) and dehydroabietylamine-4yield: 76-81% yield: 88% acid acid, paraformaldehyde and aniline ormaleopimaric 4-aminobenzoic acid, according Scheme 20, prior to filtration, methylumbelliferone spherical crystal solid, 131 °C)and areitsto fully bio-based benzoxazines Scheme(yellow 20. Synthesis of acid m.p. imidophenol benzoxazines. [157]. They can be evaporation synthesized from via Mannich condensation, according to washing and rotary [96]. dehydroabietylamine They can be polymerized into products of significant thermal Scheme 20. Synthesis of maleopimaric acid imidophenol and and itsand benzoxazines. Scheme 21. They can compound resins with strong corrosion protection thermal stability [157]. Dehydroabietylamine-guaiacol (brown powder, m.p. 104 °C) dehydroabietylamine-4stability [96]. ◦ C) methylumbelliferone (yellow spherical crystalpowder, solid, m.p. 131 °C) fully benzoxazines Dehydroabietylamine-guaiacol (brown m.p. 104are andbio-based dehydroabietylamine-4Dehydroabietylamine-guaiacol (brown powder, m.p.◦ 104 °C)O andOHdehydroabietylamine-4[157]. They can be synthesized from dehydroabietylamine via Mannich condensation, according to methylumbelliferone (yellow spherical crystal solid, m.p. 131 C) are fully bio-based benzoxazines [157]. O methylumbelliferone (yellow spherical crystal solid, m.p. 131 °C) are fully bio-based benzoxazines Scheme 21. They can compound resins with strong corrosion protection and thermal stability [157]. 21. NHcondensation, 2 They can be synthesized from dehydroabietylamine via Mannich according to Scheme [157]. They can be synthesized from dehydroabietylamine via Mannich condensation, according to HOstrong corrosion O O They can compound resins with protection thermal stability O[157]. O OH thermal stability [157]. Scheme 21. They can compound resins with strong corrosionand protection and N N O O O Dehydroabietylamine N -4-methylumbelliferone benzoxazine yield: 70% O O O N paraformaldehyde in dioxane <90°C, 20h HO O NH2 paraformaldehyde in dioxane O O 85°C, OH 20h OO Dehydroabietylamine NH2 paraformaldehyde Dehydroabietylamine N -guaiacol benzoxazine in dioxane O O yield: 64% 85°C, 20h O paraformaldehyde O in dioxane N <90°C, 20h paraformaldehyde paraformaldehyde Dehydroabietylamine in dioxane Dehydroabietylamine Scheme 21. Synthesis of fully bio-based benzoxazines. in dioxane 85°C, 20h-guaiacol benzoxazine <90°C, 20h HO Dehydroabietylamine O O O-4-methylumbelliferone yield: 64% benzoxazine yield: 70% Dehydroabietylamine Dehydroabietylamine Dehydroabietylamine 3.2.3. Hardeners -guaiacol benzoxazine -4-methylumbelliferone Scheme 21. Synthesis of fully bio-based benzoxazines. yield: 64%or benzoxazine yield: 70% Rosin-based hardeners, i.e. curing agents, are compounds containing anhydride, carboxyl hydroxyl groups, which allows one apply them in epoxy or urethane resin systems. In comparison 3.2.3. Hardeners Scheme 21.to Synthesis of fully fully bio-based Scheme 21. Synthesis of bio-basedbenzoxazines. benzoxazines. with petroleum-based hardeners they bring improved endurance and thermal properties to resin Rosin-based hardeners, i.e. curing agents, are compounds containing anhydride, carboxyl or 3.2.3. Hardeners 3.2.3. Hardeners hydroxyl groups, which allows one to apply them in epoxy or urethane resin systems. In comparison Rosin-based hardeners, i.e. curing curing agents, are compounds containing anhydride, carboxyl with petroleum-based hardeners they bring improved endurance and thermal properties to resinor or Rosin-based hardeners, i.e., agents, compounds containing anhydride, carboxyl hydroxyl groups, which allowsone onetotoapply applythem them in in epoxy or comparison hydroxyl groups, which allows or urethane urethaneresin resinsystems. systems.InIn comparison with petroleum-basedhardeners hardenersthey they bring bring improved improved endurance to to resin with petroleum-based enduranceand andthermal thermalproperties properties resin Molecules 2019, 24, x FOR PEER REVIEW 13 of 51 systems. Moreover, rosin-based anhydrides are non-toxic, as opposed to conventional anhydride curing agents. Their preparation is simple and well described, and usually does not require the use of solvents. These strengths cause the great interest in use of rosin based chemicals as hardeners of conventional and bio-based resins resulting in several commercializations of eg., maleated rosins. 13 of 52 Molecules 2019, 24, 1651 Methyl maleopimarate is a white solid. It can be prepared from abietic acid, iodomethane and maleic2019, anhydride, to Scheme 22, prior to recrystallization [82]. It can be used as bio-based Molecules 24, x FOR according PEER REVIEW 13 of 51 curing agent for epoxies [82,183], as well as in synthesis of binaphthyl-appended crown ethers systems. Moreover, rosin-based anhydrides are non-toxic, as opposed to conventional anhydride systems. Moreover, rosin-based are non-toxic, as opposed to conventional anhydride derived from rosin [184]. curing agents. Their preparation isanhydrides simple and well described, and usually does not require the use curing agents. Their preparation is simple and well described, and usually does not require the use of solvents. These strengths cause the great interest in use of rosin basedOchemicals as hardeners of O O O OThese O of solvents. cause the great interest in use of rosin based chemicals asOhardeners of O O strengths O conventional and bio-based resins resulting in several commercializations of e.g., maleated rosins. CH3I O O bio-based resins resulting in several commercializations of eg., maleated rosins. conventional and Methyl maleopimarate is a white prepared acid, iodomethane and 180°C solid. It can K2CObe 180°Cfrom abieticpTSA 3 Methyl maleopimarate is a white 3h solid. It can be prepared3hfrom abietic acid, iodomethane and pTSA in DMF maleic anhydride,in according to Scheme 22, prior to recrystallization [82]. inItCH can be used as bio-based 3COOH CHaccording 3COOH maleic anhydride, to Scheme 22, prior to 24h recrystallization [82]. It can be12h used as bio-based 25°C, 120°C, 120°C, 12h curing agent for epoxies [82,183], as well as in synthesis of binaphthyl-appended crown ethersethers derived curing agent for epoxies [82,183], as well as in synthesis of binaphthyl-appended crown COO COOH COO COOH COOH from rosin from [184]. COO derived rosin [184]. Methyl abietate Abietic Levopimaric Maleopimaric Methyl maleopimarate O O O O O yield: 81% acid acid O O O O O acid yield: 92% yield 90% CH I 3 O O 180°C of maleopimaric Scheme 22. Synthesis K2CO3 acid and methyl 180°C maleopimarate. pTSA 3h pTSA in CH3COOH Rosin-maleimidopolycarboxylic 120°C, 12h 3h in DMF in CH3COOH 24h 12h They can be acids are25°C, white/yellowy or gray/brown 120°C, powders. COO COOH COOH prepared from maleopimaricCOO acid with aspartic or 4-aminobenzoic acid, or rosin with 1,1′COOH COO (methylenedi-4,1-phenylene)bismaleimide, according to Scheme 23, before separation via such Methyl abietate Levopimaric [94,185]. They have a methods as precipitation, filtration, washing, dryingAbietic and recrystallization Maleopimaric Methyl maleopimarate yield: 81% acid agents [94,185]. acid potential to replace petroleum-based epoxy curing Furthermore, rosinacid yield: 92% yield 90% maleimidodicarboxylic acid can be used for synthesis of rosin-based chain extender for Scheme 22.Synthesis Synthesis of maleopimaric maleopimaric acid polyurethanesScheme [186], or22. epoxy resins of [84]. acidand andmethyl methylmaleopimarate. maleopimarate. Rosin-polycaprolactone flexible dianhydride are solids with a melting point depending on the Rosin-maleimidopolycarboxylic acids are white/yellowy ororrosin, gray/brown powders. They can be be length of oligoester diol chain. They can are be synthesized from oligocaprolactone diols and Rosin-maleimidopolycarboxylic acids white/yellowy gray/brown powders. They can prepared from maleopimaric acid with aspartic or 4-aminobenzoic acid, or rosin with 1,1′0 maleic anhydride according to Scheme 24 and using vacuum evaporation as a separation method prepared from maleopimaric acid with aspartic or 4-aminobenzoic acid, or rosin with 1,1 -(methylenedi(methylenedi-4,1-phenylene)bismaleimide, according to resins Scheme 23, before separation via such as [97]. Their application is bio-based curingtoagent for epoxy [97]. 4,1-phenylene)bismaleimide, according Scheme 23, before separation via such methods methods as precipitation, filtration, washing, drying and recrystallization [94,185]. They Tall-oil based polyol can be prepared from diethanolamine and tall oil containing up to 20 have wt.% a precipitation, filtration, washing, drying and recrystallization [94,185]. They have a potential to of rosin acids, according to Scheme 25, prior to vacuum evaporation water [187]. It can be used as potential to replace petroleum-based epoxy curing agents of [94,185]. Furthermore, rosinreplace petroleum-based epoxy curing agents [94,185]. Furthermore, rosin-maleimidodicarboxylic acid chain extenders in ureaurethane their thermal resistance and storage modulsfor maleimidodicarboxylic acid canelastomers, be used improving for synthesis of rosin-based chain extender can be used for synthesis of rosin-based chain extender for polyurethanes [186], or epoxy resins [84]. [187]. polyurethanes [186], or epoxy resins [84]. Rosin-polycaprolactone flexible dianhydride are solids with a melting point depending on the length of diol chain. They canCOOH be synthesized fromLevopimaric rosin, oligocaprolactone diols and H2Noligoester COOH acid O maleic anhydride according to NScheme 24 and using vacuum evaporation as a separation method HOOC in DMF O [97]. Their application agent for epoxyO resins [97]. O 160°C, 4h is bio-based curing pTSA; in CH3COOH O Tall-oil based polyol can be prepared from diethanolamine and tall oil containing up to 20 wt.% O 120°C, 12h N N of rosin acids, according to Scheme 25, prior to vacuum evaporation of water [187]. It can be used as O O O chain extenders in ureaurethane elastomers, improving their thermal resistance and storage moduls COOH [187]. O H2N COOH Rosin-maleimidodicarboxylic acid yield: 87% COOH COOH O Maleopimaric in DMFNH2 acid 160°C, 4h O COOH HOOC N COOH O COOH Rosin-maleimidotricarboxylic acid COOH yield: 54% O O HOOC O N N O O N Levopimaric acid O O HOOC COOH O in DMF O 165-180°C 6.5h N N O pTSA; in CH3COOH COOH COOH 120°C, 12h O Dirosin-maleimidodicarboxylic acid yield: 87% O N Rosin-maleimidodicarboxylic Scheme 23. Synthesis of rosin-maleimidodicarboxylic acids. acid yield: 87% N O O O Rosin-polycaprolactone flexible dianhydride are solids with a melting point depending on the O Maleopimaric NH2 length be synthesized from rosin, oligocaprolactone diols and acidof oligoester diol chain. They canHOOC maleic anhydride according to Scheme 24 and using vacuum evaporation as a separation method [97]. HOOC COOH N COOH COOH COOH Their application is bio-based curing agent for epoxy resins [97]. in DMF O COOH 165-180°C Tall-oil based polyol can be prepared from diethanolamine and tall oil containing up to 20 wt.% of Rosin-maleimidotricarboxylic Dirosin-maleimidodicarboxylic 6.5h rosin acids, according to Scheme 25, prior to vacuum evaporation of water [187]. can be used as chain acid yield: 54% acid Ityield: 87% extenders in ureaurethane elastomers, improving their thermal resistance and storage moduls [187]. Molecules 2019, 2019, 24, 24, xx FOR FOR PEER PEER REVIEW REVIEW Molecules Molecules 2019, 24, x FOR PEER REVIEW Molecules 2019, 24, 1651 14 of of 51 14 14 of 51 51 14 of 52 Scheme 23. Synthesis of rosin-maleimidodicarboxylic acids. Scheme acids. Scheme23. 23.Synthesis Synthesis of of rosin-maleimidodicarboxylic rosin-maleimidodicarboxylic acids. OO O COOH COOH COOH HOHO HO RR HOHO R HO O OO OO O RR R OO O OO O O O O O OO O OO O O O O O O O O O O OO pTSA pTSA pTSA nano-ZnO) (or(or nano-ZnO) (or nano-ZnO) 230-240°C, 230-240°C, 5h5h 230-240°C, 5h Abietic Abietic Abietic acidacid acid O OO HH33PO PO4 4 H3PO 4 180-190°C 180-190°C 180-190°C 4h 4h R R R O O OO O O 4h OO O O O O O O HOHO R = HO O(CH2)2O(CH2)2O [ C R == H H O(CH [ O(CH 2)5 CC ]mO(CH O(CH2))2O O[C C HOR [ ] 2))5 C 2))2O(CH m H O(CH O(CH HO [ ]m 2 5 2 2 2 2 [ HO (CH2)5O ]n H (CH2))5O O ]n H H (CH 2 5 ]n M = 530, 1000, 1250 O O O O Rosin-polycaprolactone anhydride Rosin-polycaprolactone anhydride Rosin-polycaprolactone anhydride curing agent yield: 76% curing agent yield: 76% curing agent yield: 76% n 530, 1000, 1250 Mn == M n 530, 1000, 1250 Scheme 24.Synthesis Synthesisof ofrosin-polycaprolactone rosin-polycaprolactone anhydride curing agent. Scheme Scheme 24. 24. Synthesis Synthesis of of rosin-polycaprolactone rosin-polycaprolactone anhydride anhydride curing curing agent. agent. Scheme 24. anhydride curing agent. O HO O O O R R R OH N H HO HO OH N N H 140°C, 5h H OH TallOH oil R OH OH O R R 140°C, 5h 5h 140°C, Tall oil oil Tall OH O O R R= CH3 (CH2)7 CH OH OH N O O O and OH OH O O and and OH R R O NH O Tall oil-based polyol NH O NH CH (CH2)7 CH3 (CH (CH2))7 CH CH CH CH R= CH R= 3 2 7 OH N N (CH2))7 (CH 2 7 or R= OH OH or R= R= or Tall oil-based polyol Tall Scheme 25.oil-based Synthesispolyol of tall oil-based polyol. Scheme 25. 25. Synthesis Synthesis of of tall tall oil-based oil-based polyol. polyol. Scheme 3.2.4. Surfactants 3.2.4. Surfactants 3.2.4. Surfactants 3.2.4. Small/medium molecule rosin-based surfactants are ionic or non-ionic compounds that lower surface tension between different substances. In comparison with counterparts, Small/medium molecule rosin-based surfactants are ionic or non-ionic that lower Small/medium molecule rosin-based ionic orpetrochemical non-ionic compounds compounds thatthey lower Small/medium molecule rosin-based surfactants are ionic or non-ionic compounds that lower are characterized by designable surface activity, affinity to many chemicals (especially cycloaliphatic surface tension between different substances. In comparison with petrochemical counterparts, they surface tension between different substances. In comparison with petrochemical counterparts, they surface tension between different substances. In comparison with petrochemical counterparts, they and aromatic), non-toxicity, mild biocidal properties and enhanced thermal stability. Unfortunately, are characterized by designable surface activity, affinity to many chemicals (especially cycloaliphatic are characterized characterized by by designable surface activity, activity, affinity affinity to to many many chemicals chemicals (especially (especially cycloaliphatic cycloaliphatic are their syntheses are designable less wellmild described than rosin-based resins and hardeners, eg. reaction yields are and aromatic), non-toxicity, biocidal properties and enhanced thermal stability. and aromatic), non-toxicity, mild biocidal properties Unfortunately, andoften aromatic), non-toxicity, mildthe biocidal properties and enhanced thermal Unfortunately, unavailable. Moreover, use of unsustainable chemicals in the stability. mentioned reactions their reaction yields are their syntheses syntheses are areless lesswell welldescribed describedthan thanrosin-based rosin-basedresins resinsand andhardeners, hardeners,e.g., eg. reaction are their syntheses are less well described than rosin-based resins and hardeners, eg. yields noticeably decreases the “green” aspect of these rosin derivatives. Therefore, it is an urgent need toare often unavailable. Moreover, the use of unsustainable chemicals in the mentioned reactions noticeably often unavailable. unavailable. Moreover, the the use of of unsustainable unsustainable chemicals chemicals in in the the mentioned mentioned reactions reactions often undertake appliedMoreover, studies on theseuse compounds, as well as to find more sustainable preparation decreases the “green”the aspect of these rosin derivatives. Therefore, it is an urgent need to undertake noticeably decreases “green” aspect of these rosin derivatives. Therefore, it is an urgent need to noticeably the “green” aspect ofgroup these of rosin processesdecreases in order to increase TRL of this rosinderivatives. derivatives.Therefore, it is an urgent need to applied studies on these compounds, ascompounds, well as to find more sustainable preparation processes in order undertake applied studies on these as well as to find more sustainable preparation undertake applied studies on these compounds, as well as toliquid. find more sustainable preparation Dehydroabietyl phosphate diester is a yellow viscous It can be prepared from to increase TRL of this group of rosin derivatives. processes in order to increase TRL of this group of rosin derivatives. dehydroabietyl decanediol, and polyphosphorus acid according to Scheme 26, prior to processes in order chloride, to increase TRL of this group of rosin derivatives. Dehydroabietyl phosphate diester is yellow viscous can be prepared from Dehydroabietyl phosphate and diester is a[140]. yellow viscous liquid. ItIt can can from washing, vacuum evaporation drying It can be usedliquid. as highly-active surfactant [140], Dehydroabietyl phosphate diester is aa yellow viscous liquid. It be prepared from dehydroabietyl chloride, decanediol, and polyphosphorus acid according to Scheme 26, prior dehydroabietyl chloride, 26, prior prior to to phosphorus source and crystal growthand control agent in synthesis hydroxyapatite [188]. 26, dehydroabietyl chloride, decanediol, polyphosphorus acidofaccording to Scheme to washing, vacuum evaporation and drying [140]. It can be used as highly-active surfactant [140], washing, vacuum evaporation and drying [140]. It washing, vacuum evaporation and drying [140]. It can be used as highly-active surfactant [140], phosphorus control phosphorus source source and andcrystal crystalgrowth growth controlagent agentin insynthesis synthesisof ofhydroxyapatite hydroxyapatite[188]. [188]. O phosphorus source and crystal growth control agent in synthesis of hydroxyapatite [188]. HO(CH2)10OH in CHCl3 <80°C;reflux HO(CH2))105h OH HO(CH 2 10OH COCl in CHCl3 in CHCl3 <80°C;reflux <80°C;reflux 5h Dehydroabietyl 5h COCl chloride COCl Dehydroabietyl Dehydroabietyl chloride chloride HO P O H NaOH OH O n O in P CHCl HO O H HO P O 3 H reflux;6h OH COO OH in CHCl CHCl3 in (CH2)103 reflux;6h reflux;6h HO COO COO yield 90.2% (CH2))10 (CH 2 10 nn NaOH NaOH COO(CH2)10O O(CH2 )10OOC O P OH Dehydroabietyl COO(CH2))10O O O(CH O(CH2))10OOC OOC COO(CH phosphate (DDPD) 2 diester 10 2 10 O 82.8% OH yield P OH O P COO(CH2)10O O(CH2 )10OOC O P ONa DDPD sodium salt COO(CH2))10O O O(CH O(CH2))10OOC OOC COO(CH 2 10 2 10 O O P P ONa ONa Dehydroabietyl DDPD sodium sodium salt salt Dehydroabietyl Scheme 26. HO Synthesis of phosphate dehydroabietyl phosphate diester sodiumDDPD salt. diester (DDPD) HO phosphate diester (DDPD) yield 82.8% 82.8% yield 90.2% 90.2% yield yield Rosin-based chloride can be prepared from maleated rosin and phosphorus trichloride Scheme 26. Synthesis Synthesis of dehydroabietyl dehydroabietyl phosphate diester sodium salt. according to Scheme 27, 26. prior to evaporation [101]. It can be used as a substrate for synthesis of rosinScheme phosphate diester sodium salt. Scheme 26. of based ester amines [101]. Rosin-based be prepared from from maleated rosin and phosphorus trichloridetrichloride according Rosin-basedchloride chloridecan can be prepared prepared from maleated maleated rosin and phosphorus phosphorus trichloride Rosin-based chloride can be rosin and to Scheme 27, prior to evaporation [101]. It can be used as a substrate for synthesis of rosin-based ester according to to Scheme Scheme 27, 27, prior prior to to evaporation evaporation [101]. [101]. It It can can be be used used as as aa substrate substrate for for synthesis synthesis of of rosinrosinaccording amines [101]. based ester ester amines [101]. [101]. based amines Rosin-based ester tertiary amine can be prepared from rosin chloride and N,N-dimethyl Molecules 2019, 24, x FOR PEER REVIEW 15 of 51 ethanolamine according to Scheme 27, prior to washing, drying, extraction, evaporation and recrystallization [101]. Potential include drug carriers and surfactants. Its surface activity Molecules 2019, 24, x FOR PEER REVIEWapplications 15 of 51 Rosin-based ester tertiary amine can be prepared from rosin chloride and N,N-dimethyl significantly increases in presence of rosin phosphate ester (Scheme 26) [101]. ethanolamine according to Scheme 27, prior to washing, drying, extraction, evaporation and Rosin-based esterPotential tertiary applications amine can include be prepared from rosin chloride and N,N-dimethyl Molecules 2019, 24, 1651[101]. 15 of 52 recrystallization activity O O drug carriers and surfactants. Its surface O ethanolamine according to Scheme 27, prior to washing, drying, extraction, evaporation and significantly increases in presence of rosin phosphate ester (Scheme N 26) [101]. PCl3 OH Potential N recrystallization [101]. applications includeCldrugHO carriers and surfactants. Its surface activity N significantly increases of rosin phosphate (Scheme 26) [101]. 2H5)3N OOH ininpresence O Cl ester (C O CHCl3 O OH O OH OH O OH COOH Maleic rosin COOH 55°C, PCl33h in CHCl COCl PCl3 3 55°C, 3h Rosin-based in CHCl3 55°C, 3h O Cl O Cl Cl chloride O Cl in benzene N HO25°C, 3h (C2H5)3NN HOin benzene (C25°C, H ) 3h N N COO N N N Rosin-based ester O tertiary N amine purity 81.18% N 2 5 3 in benzene COO O 25°C, 3h Scheme 27. Synthesis of rosin-based ester tertiary amine. O O O COCl O Rosin-based ester tertiary N amine purity 81.18% COOH COCl COO Rosin-based ester tertiary Solid N-dodecyl-maleimidepimaric acid (C12-MPA) can be prepared from maleopimaric acid Maleic rosin Rosin-based chloride Scheme27. 27. Synthesis Synthesis of rosin-based ester amine. amine purity 81.18% Scheme ester tertiary tertiary and dodecylamine according to Scheme 28, prior to washing, drying,amine. filtration, rotary evaporation and purification via Scheme column chromatography [100]. Sodium N-dodecylmaleimidepimaric Synthesis of rosin-based tertiary amine. Rosin-based ester tertiary 27. amine can be preparedester from chloride and N,N-dimethyl Solid N-dodecyl-maleimidepimaric acid (C12-MPA) can be rosin prepared from maleopimaric acid carboxylate is a product of C12-MPA neutralization using NaOH, prior to evaporation, ethanolamine according to Scheme 27, 28, prior to towashing, extraction, evaporation and and dodecylamine according to Scheme prior washing, drying, drying, filtration, rotary evaporation recrystallization and vacuum drying. It forms micellescan ofbevarious shapes, maleopimaric depending onacid its N-dodecyl-maleimidepimaric acid (C12-MPA) prepared recrystallization [101]. include drugSodium carriers andfrom surfactants. Its surface and Solid purification via Potential column applications chromatography [100]. N-dodecylmaleimidepimaric concentration [102]. It can be used in oil extraction, and industrial washing [100]. and dodecylamine to presence Scheme 28, prior tocosmetics washing, drying, filtration, rotary evaporation carboxylate is a according product C12-MPA neutralization using NaOH, prior to evaporation, activity significantly increases of in of rosin phosphate ester (Scheme 26) [101]. Acrylpimaryl dichloride is an orange, sticky paste. It can be prepared from acrylpimaric acid and purification via column chromatography [100]. Sodium N-dodecylmaleimidepimaric recrystallization and vacuum drying.acid It forms micelles of prepared various shapes, depending acid on and its Solid N-dodecyl-maleimidepimaric (C12-MPA) can be from maleopimaric according to Scheme 29, priorofto solvent evaporation [128]. Itusing can beNaOH, used in synthesis ofevaporation, surfactants carboxylate a product C12-MPA neutralization prior to[100]. concentrationisaccording [102]. It cantobe used in28, oilprior extraction, cosmetics and industrial dodecylamine Scheme to washing, drying, filtration,washing rotary evaporation and [128], herbicides [129], fungicidesdrying. [189] and [190]of various shapes, depending on its recrystallization and vacuum It insecticides forms micelles Acrylpimaryl dichloride is an orange, sticky paste. It can be prepared from acrylpimaric acid purification via column chromatography [100]. Sodium N-dodecylmaleimidepimaric carboxylate is a Acrylic rosin ester diethylamine tertiary amine surfactant is industrial a sticky paste. It can be prepared concentration [102]. It can be used in oil extraction, cosmetics and washing [100]. according to Schemeneutralization 29, prior to solvent [128]. It can be used in synthesis of and surfactants product of C12-MPA usingevaporation NaOH, prior to evaporation, recrystallization vacuum fromAcrylpimaryl acrylpimaryl chloride, N,N-diethylethanolamine andIthydrochloric acid according to Scheme 29 dichloride is an[189] orange, sticky paste. can be prepared from acrylpimaric acid [128], herbicides [129], fungicides anddepending insecticides [190] drying. It forms micelles of various shapes, on its concentration [102]. It can be used in [128]. Thistoproduct, in mixture with soapnut saponin noteworthy surfaceofactivity andoil according Scheme 29,adiethylamine prior to solvent evaporation [128].exhibits It canisbe used inpaste. synthesis surfactants Acrylic rosin ester tertiary amine surfactant a sticky It can be prepared extraction, cosmetics and industrial washing [100]. emulsification ability tofungicides apply in pharmacy, cosmetics and commodity chemicals [128]. [128], herbicides [129], [189] and insecticides [190] from acrylpimaryl chloride, N,N-diethylethanolamine and hydrochloric acid according to Scheme 29 rosin ester tertiary amine surfactant is anoteworthy sticky paste.surface It can be prepared [128].Acrylic This product, in2 diethylamine a mixture soapnut saponin exhibits activity and C12Hwith O C12H25NH O 25 O acrylpimaryl O from chloride, N,N-diethylethanolamine and hydrochloric acid according to Scheme 29 emulsification ability to apply inNpharmacy, cosmetics and commodity chemicals [128]. in DMF [128]. This product, in a mixture with O O soapnut saponin exhibits noteworthy surface activity and N NaOH <165°C, 8h O emulsification ability to2 apply inCpharmacy, cosmetics and commodityO chemicals [128]. C12H25NH 12H25 Maleic rosin Rosin-based chloride in C2H5OH O O O DMF Cin 12H25NH2 O <165°C, COOH 8h O in DMF <165°C, 8h O O N C12H25 O 70°C, 12h O ON NaOH COO Na Sodium N-dodecyl-maleimidepimaric ON MaleopimaricCOOH N-dodecylcarboxylate in C2H5OH acid Sodium 70°C, 12h 29% COO Na yield O 76% maleimidepimaric acid yield COOH N-dodecyl-maleimidepimaric COOH COO Na Maleopimaric carboxylate Scheme28. 28. Synthesis Synthesis of sodium N-dodecyl-maleimidepimaric carboxylate. Sodium Scheme N-dodecyl-maleimidepimaric carboxylate. N-dodecylCOOH acid yield 76% N-dodecyl-maleimidepimaric maleimidepimaric acid yield 29% Maleopimaric dichloride COOH COCl carboxylate Acrylpimaryl is an orange, sticky paste. It can be prepared from acrylpimaric acid N-dodecylH PCl3 28. Synthesis of sodium N-dodecyl-maleimidepimaric Nyield 76% OH acid Scheme carboxylate. N maleimidepimaric acid yield 29% N according to Scheme 29, prior to solvent evaporation [128]. It can be used in synthesis ofClsurfactants [128], Cl in CHCl3 herbicides [129], fungicides [189] and insecticides [190] COOH COCl of sodium N-dodecyl-maleimidepimaric carboxylate. 55°C, 3h 28. Synthesis Scheme COOH PCl3 in CHCl3 PCl3h 3 55°C, COOH Acrylic rosin N in CHCl3 COOH 55°C, 3h COCl O in C2H5OH COOH 70NaOH °C, 12h COCl (C2H5)3NOH N in benzene 25°C, 3h OH N (C2H5)3N COCl Acrylic rosin in benzene chloride Acrylic (C25°C, H ) 3h N COO COO N HCl N N COO Cl HCl ClCOO N COO H N H N H N Cl H Cl N COO HCl COO COO rosin H 2 5 3 N yield 96%COCl N N,N-diethyl in benzene Acrylic rosin Acrylic rosin ethanolamine diester Acrylic rosin ester COO 25°C, 3h COO chloride Acrylic rosin yield 87% diethylamine tertiary amine Acrylic rosin Acrylic rosin yield 96% N,N-diethyl surfactant yield: 100% COO COO chloride Acrylic rosin diester ethanolamine Acrylic rosin ester yield Scheme 29. Preparation of 96% acrylic rosin ester tertiarydiethylamine amine surfactant. N,N-diethyl yielddiethylamine 87% tertiary amine ethanolamine diester Acrylicyield: rosin 100% ester surfactant yield 87% diethylamine tertiary amine Scheme 29. Preparation of acrylic rosin ester diethylamine tertiary amine surfactant.yield: 100% surfactant COOH Scheme29. 29.Preparation Preparation of of acrylic acrylic rosin Scheme rosin ester ester diethylamine diethylaminetertiary tertiaryamine aminesurfactant. surfactant. Acrylic rosin ester diethylamine tertiary amine surfactant is a sticky paste. It can be prepared from acrylpimaryl chloride, N,N-diethylethanolamine and hydrochloric acid according to Scheme 29 [128]. Molecules 2019, 24, 1651 16 of 52 This product, in a mixture with soapnut saponin exhibits noteworthy surface activity and emulsification Molecules 2019, 24, x FOR PEER REVIEW 16 of 51 Molecules 2019, 24,in x FOR PEER REVIEW 16 of 51 ability to apply pharmacy, cosmetics and commodity chemicals [128]. Quaternary Theycan canbe beprepared preparedfrom from Quaternaryammonium ammonium salts salts of of rosin rosin esters esters are are yellow yellow solids. solids. They Quaternary ammonium salts in ofSection rosin esters are yellow solids. They can be prepared from maleopimaryl chloride (described 3.2.5) and N,N-diethylethanolamine with hexadecyl maleopimaryl chloride (described in subsection 3.2.5) and N,N-diethylethanolamine with hexadecyl maleopimaryl chloride (described in subsection 3.2.5) and N,N-diethylethanolamine with hexadecyl bromide, to Scheme Scheme 30, 30,and andusing usingsuch suchseparation separation bromide,ororepichlorohydrin epichlorohydrinwith withtriethylamine, triethylamine, according according to bromide, or epichlorohydrin with triethylamine, according to Scheme 30, and using such separation methods drying,extraction extractionand andrecrystallization recrystallization[104,191]. [104,191]. methodsasasvacuum vacuumdistillation, distillation,filtration, filtration, washing, drying, methods as vacuum distillation, filtration, washing, drying, extraction and recrystallization [104,191]. Maleopimaric Maleopimaric acid acid O O O O O O COOH COOH O O Cl Cl O O Maleopimaryl Maleopimaryl chloride chloride N N (CH2)15CH3 (CH2)15CH3 HO HO O O (C2H5)3N (Ctoluene 2H5)3N in in toluene 98°C, 6h 98°C, 6h N N CH3(CH2)15Br CH3(CH2)15Br C O C O O O Cl O Cl O (C2H5)3N (C2H5)3N 50°C 50°C 4h 4h OH OH O O O O O O O O 90°C, 5h 90°C, 5h N N COO COO Diethylaminoethyl rosin ester Diethylaminoethyl rosin ester quaternary ammonium salt quaternary ammonium salt yield: 85% yield: 85% Rosin Rosin 2-hydroxypropyl 2-hydroxypropyl chloride ester O chloride ester O O O O O O O COCl COCl O O O O Cl Cl O O in toluene in toluene 95°C, 4h 95°C, 4h O O COO COO Br Br Cl Cl C O C O O O O O Rosin diethylaminoethyl Rosin diethylaminoethyl ester yield: 80% ester yield: 80% O O N N Cl Cl OH OH Rosin 2-hydroxypropyl-triethyl Rosin 2-hydroxypropyl-triethyl ammonium chloride yield: 72% ammonium chloride yield: 72% Scheme30. 30. Synthesis of of quaternary ammonium salts Scheme saltsof ofrosin rosinesters. esters. Scheme 30.Synthesis Synthesis ofquaternary quaternary ammonium ammonium salts of rosin esters. Their [104,191,192]dispersants dispersantsfor formagnetite magnetite Theirpotential potentialapplications applicationsinclude include corrosion corrosion inhibitiors [104,191,192] Their potential applications include corrosion inhibitiors [104,191,192] dispersants for magnetite (Fe 3O nanoparticles[191,192] [191,192] and and inhibitors in protein (Fe protein aggregation aggregationprocesses processes[193–195]. [193–195].InInaddition, addition, 3O 4 )4)nanoparticles (Fe3O4) nanoparticles [191,192] and inhibitors in protein aggregation processes [193–195]. In addition, similarrosinyl rosinyltriquaternary triquaternaryammonium ammoniumsalt salt having having antifungal antifungal activity a asimilar activity was was also alsoreported reported[196]. [196]. a similar rosinyl triquaternary ammonium salt having antifungal activity was also reported [196]. Anotherapproach approach to to introduce introduce quaternary quaternary ammonium ammonium moieties Another moieties into into rosin rosinisispresented presentedinin Another approach to introduce quaternary ammonium moieties into rosin is presented in Scheme3131[197]. [197].As Asititcan canbe beseen, seen, rosin rosin bisquaternary bisquaternary ammonium Scheme ammonium chloride chloridecan canbe beprepared preparedfrom from Scheme 31 [197]. As it can be seen, rosin bisquaternary ammonium chloride can be prepared from rosin, ethanol, fumaric acid and epoxy quaternary ammonium salt, and using such separation rosin, ethanol, fumaric acidacid and and epoxy quaternary ammonium salt, and separation methods rosin, ethanol, fumaric epoxy quaternary ammonium salt,using andsuch using such separation asand washing and drying. Thusgemini obtained gemini surfactant has good surfaceand activity and asmethods washing drying. Thus obtained surfactant has good surface activity antifungal methods as washing and drying. Thus obtained gemini surfactant has good surface activity and antifungal activity fungi responsible for wood [197]. activity against fungiagainst responsible for wood decay [197].decay antifungal activity against fungi responsible for wood decay [197]. HOOC HOOC OH OH ZnO ZnO3.5h 180°C, 180°C, 3.5h COOH COOH Levopimaric Levopimaric acid acid COOH COOH O O p-hydroquinone p-hydroquinone 230°C, 3h 230°C, 3h OH OH O O OH OH O O Cl Cl N N 82°C, 8.5h 82°C, 8.5h Cl Cl N N OH OH O O O O O O O O Cl Cl N N OH OH COO Ethyl COO Ethyl levopimarate levopimarate Ethyl Ethyl fumaropimarate fumaropimarate COO COO Rosin Rosin bisquaternary bisquaternary ammonium salt ammonium yield: 93% salt yield: 93% COO COO Scheme 31. Preparation of rosin bisquaternary ammonium salt. Scheme31. 31.Preparation Preparationof of rosin rosin bisquaternary bisquaternary ammonium Scheme ammonium salt. salt. Dehydroabietyltrimethyl ammonium bromide is a yellow solid. It can be prepared from Dehydroabietyltrimethyl can be be prepared prepared from from Dehydroabietyltrimethyl ammonium ammonium bromide bromide is is aa yellow yellow solid. solid. ItIt can dehydroabietylamine, formic acid and methyl bromide according to Scheme 32, and using such dehydroabietylamine,formic formic acid acid and and methyl methyl bromide bromide according according to dehydroabietylamine, to Scheme Scheme 32, 32, and and using usingsuch such separation techniques as washing, extraction and evaporation, drying, vacuum distillation and separationtechniques techniquesasaswashing, washing, extraction extraction and and evaporation, evaporation, drying, separation drying, vacuum vacuum distillation distillationand and recrystallization [158]. Such surfactant can be used for preparation of ordered porous titania [159], recrystallization[158]. [158].Such Suchsurfactant surfactant can can be used for preparation recrystallization preparation of of ordered orderedporous poroustitania titania[159], [159], zirconia [198] or silica [158] with potential applications in catalysis and separation. zirconia [198]ororsilica silica[158] [158]with withpotential potentialapplications applications in in catalysis catalysis and separation. separation. zirconia [198] Molecules 2019, 24, 1651 17 of 52 Molecules 2019, 2019, 24, 24, xx FOR FOR PEER PEER REVIEW REVIEW Molecules 17 of of 51 51 17 HCOOH CH33Br in acetone 25°C, 4h 4h 25°C, HCHO HCHO O in ethanol/H ethanol/H22O in <80°C, 9h 9h <80°C, NH222 NH N N N,N-dimethyl N,N-dimethyl dehydroabietylamine dehydroabietylamine Dehydroabietylamine Dehydroabietylamine Br Br N N Dehydroabietyltrimethyl Dehydroabietyltrimethyl ammonium bromide bromide ammonium Scheme 32. 32. Synthesis of dehydroabietyltrimethyl dehydroabietyltrimethyl ammonium ammonium bromide. Synthesis of bromide. bromide. Scheme Another can be prepared from dehydroabietyl chloride, Anotherrosin-based rosin-basedgemini gemini surfactants surfactants [143,199] [143,199] can can be be prepared prepared from from dehydroabietyl dehydroabietyl chloride, chloride, Another rosin-based gemini surfactants [143,199] 3-(dimethylamino)-1-propylamine and α,ω-dibromoalkanes to Scheme 33. The product 3-(dimethylamino)-1-propylamine and α,ω-dibromoalkanes according Scheme 33. The product and to to separation separation methods methods include include column column chromatography, chromatography, vacuum vacuum drying drying and and recrystallization recrystallization from from separation methods include column chromatography, vacuum drying and recrystallization from ethanol/ethyl They can can be used used preparation of three-dimensional mesoporous ethanol/ethyl acetate acetate [143]. [143]. They preparation of three-dimensional mesoporous used in in in materials materialsfor forseparations, separations,catalysis catalysisand anddrug drugdelivery delivery[143]. [143]. materials for separations, catalysis and drug delivery [143]. H222N N H Br (( ))n-2 n-2 Br Br Br n={3,6,8,10} n={3,6,8,10} in C C22H H55OH OH in 80°C, °C, 36h 36h 80 N N 0°C, 2h COCl COCl O O Dehydroabietyl Dehydroabietyl chloride chloride C C N N H H Br Br O O N N C C 3-(N,N-dimethyl)-propyl 3-(N,N-dimethyl)-propyl dehydroabietamide N N H H N N Br Br ( )n-2 n-2 N N N N H H C C O O Rosin-based Gemini Gemini surfactant surfactant Rosin-based Scheme 33. 33. Synthesis Synthesis of of rosin-based rosin-based gemini gemini surfactant. surfactant. Scheme Rosin-based cyclic tricarbonate tricarbonate is brownsolid. solid.It It can be prepared maleopimaric Rosin-based cyclic tricarbonate isisaaabrown brown solid. It can can be prepared prepared fromfrom maleopimaric acid Rosin-based be from maleopimaric acid acid triglycidyl and carbon dioxide according to Scheme 34, to prior to washing and vacuum triglycidyl ester ester and carbon carbon dioxide according to Scheme Scheme 34, prior prior to washing and vacuum vacuum drying triglycidyl ester and dioxide according to 34, washing and drying drying [132]. Its applications synthesis of quaternary ammonium salt derivatives and [132]. Its applications includeinclude synthesis of quaternary ammonium salt derivatives [132] [132] and nonnon-isocyanate polyurethanes [200]. Rosin-based carbamate group-containing quaternary ammonium isocyanate polyurethanes polyurethanes [200]. [200]. Rosin-based Rosin-based carbamate carbamate group-containing group-containing quaternary quaternary ammonium ammonium isocyanate salt derivatives are are brown brownsolids. solids.They They be prepared rosin-based tricarbonate, salt derivatives are brown solids. They cancan be prepared prepared fromfrom rosin-based cycliccyclic tricarbonate, N,Nsalt can be from rosin-based cyclic tricarbonate, N,NN,N-dimethylaminopropylamine and alkyl bromides according to Scheme and vacuum using vacuum dimethylaminopropylamine and alkyl bromides according to Scheme 34, and34, using drying drying and recrystallization [132].exhibit They exhibit strong antimicrobial properties and recrystallization recrystallization [132]. They They exhibit strong antimicrobial antimicrobial properties [132]. [132]. and [132]. strong properties [132]. CO22 O O Maleopimaric acid acid Maleopimaric triglycidyl ester ester triglycidyl O O O O O O O O O O COO COO O O O O O R N N R H H O O N N R= R= Rosin-base carbamate yield: 92% 92% yield: R N N R H H COO COO or: R= R= N N O O OH OH O O O O Rosin-based Rosin-based cyclic carbonate carbonate cyclic O O yield: 89% 89% yield: O O 2, or or 5, 5, or or 11 11 nn == 2, O O O O OH OH O O Br(CH222))nnnCH CH333 Br(CH O O O O O O in ethanol; 70°C, 15h O O H H R N N R in ethanol ethanol in 75°C, 2h 2h 75°C, H222N N H N N O O O O O O O O O O N N H H R N N R O O O O LiBr/ethane-1,2-diol O O in NMP NMP in 110°C, 2MPa 2MPa 110°C, 7h 7h O O O COO COO O O COO COO R N N R H H Br Br N N (CH222))nnnCH CH333 (CH N N (CH222))nnnCH CH333 (CH Br Br Rosin-basedcarbamate group-containing quaternary quaternary group-containing ammonium salt salt derivative derivative ammonium yield: 78%, 78%, or or 85%, 85%, or or 80% 80% yield: R N N R H H Br Br N N (CH222))nnnCH CH333 (CH Scheme34. 34.Synthesis Synthesis of rosin-based rosin-based carbamate and carbamate carbamate group-containing quaternary Scheme 34. Synthesis of carbamate and group-containing quaternary Scheme of rosin-based carbamate and carbamate group-containing quaternary ammonium ammonium salt derivatives. derivatives. ammonium salt salt derivatives. Molecules 2019, 24, 1651 18 of 52 Molecules Molecules 2019, 2019, 24, 24, xx FOR FOR PEER PEER REVIEW REVIEW Molecules 2019, 24, x FOR PEER REVIEW 18 18 of of 51 51 18 of 51 Maleopimaric acid diethanolamide diethanolamideis solid.It It can be synthesized from maleopimaric Maleopimaric be from maleopimaric acid and Maleopimaric acid acid diethanolamide isisaaasolid. solid. It can can be synthesized synthesized from maleopimaric acidacid and Maleopimaric acid diethanolamide is a35solid. It It can bebe synthesized from maleopimaric acid and and diethanolamine according to Scheme [103]. can applied as a dispersant and a viscosity diethanolamine diethanolamine according according to to Scheme Scheme 35 35 [103]. [103]. It It can can be be applied applied as as aa dispersant dispersant and and aa viscosity viscosity diethanolamine according to Scheme 35 [103]. It can be applied as a dispersant and a viscosity depressant depressant in coal-water slurry [103]. depressant in in coal-water coal-water slurry slurry [103]. [103]. depressant in coal-water slurry [103]. OH OH OH O O O N N N O O O Maleopimaric Maleopimaric Maleopimaric acid acid acid OH OH OH KOH KOH KOH 4h 160°C, 160°C, 4h 160°C, 4h O O O COOH COOH COOH O O O O O O N N N OH OH O OH O O OH OH OH N N N OH OH OH OH OH OH N N N OH OH OH Maleopimaric Maleopimaric acid acid Maleopimaric acid diethanolamide diethanolamide diethanolamide OH OH OH Scheme Scheme 35. 35. Synthesis Synthesis of of maleopimaric maleopimaric acid acid diethanolamide. diethanolamide. Scheme 35. Synthesis of maleopimaric acid diethanolamide. Acrylpiamric Acrylpiamric acid acid salts salts of of calcium calcium and and zinc zinc are are solids. solids. They They can can be be prepared prepared from from acrylpimaric acrylpimaric Acrylpiamric acid salts of calcium and zinc are solids. They can be prepared from acrylpimaric acid, acid, sodium sodium hydroxide hydroxide and and calcium calcium chloride chloride or or zinc zinc sulfate sulfate according according to to Scheme Scheme 36 36 and and using using such such acid, sodium hydroxide and calcium chloride or zinc sulfate according to Scheme 36 and using such separation methods as washing, filtration and drying [137]. They can be used stabilizer They can be used as a separation methods as washing, filtration and drying [137]. They can be used as a stabilizer of of separation methods as washing, filtration and drying [137]. They can be used as a stabilizer of poly(vinyl showing better thermal stability than commercial Ca/Zn stearate [137]. poly(vinyl chloride) chloride) showing showing better betterthermal thermalstability stabilitythan thancommercial commercialCa/Zn Ca/Znstearate stearate[137]. [137]. poly(vinyl chloride) showing better thermal stability than commercial Ca/Zn stearate [137]. COO COO COO ZnSO ZnSO44** 7H 7H22O O ZnSO4* 7H2O 22 COO COO COO Zn Zn2 Zn Zinc Zinc acrylpimarate acrylpimarate Zinc acrylpimarate COOH COOH COOH NaOH NaOH NaOH NaOH NaOH NaOH in in in acetone/water acetone/water in acetone/water acetone/water in water/ethanol acetone/water in water/ethanol acetone/water water/ethanol water/ethanol water/ethanol water/ethanol -15-50°C -15-50°C COOH -15-50°C -15-50°C COOH -15-50°C -15-50°C COOH 27h 27h 27h 27h Acrylpimaric acid Acrylpimaric acid 27h 27h Acrylpimaric acid COO COO COO CaCl CaCl22 CaCl2 22 COO COO Ca Ca2 Ca Calcium acrylpimarate Calcium COO acrylpimarate Calcium acrylpimarate Scheme 36. acid divalent metal salts. Scheme 36. 36. Synthesis Synthesis of of acrylpimaric acrylpimaric acid acid divalent divalent metal metal salts. salts. Scheme Synthesis of acrylpimaric Synthesis of acrylpimaric Rosin-derived binapthyl-appended 22-crown-6 ether can from Rosin-derivedbinapthyl-appended binapthyl-appended 22-crown-6 ether can be be synthesized synthesized from methyl methyl Rosin-derived 22-crown-6 ether can be synthesized from methyl maleopimarate, Rosin-derived binapthyl-appended 22-crown-6 ether can be synthesized from methyl maleopimarate, sodium borate and sodium hydride according to Scheme 37 It can maleopimarate, sodium borate and sodiumto hydride according to Scheme 37in[184]. [184]. Itenantioselective can be be used used in in sodium borate and sodium hydride according Scheme 37 [184]. It can be used highly maleopimarate, sodium borate and sodium hydride according to Scheme 37 [184]. It can be used in highly enantioselective reactions because of its amines enantiomeric recognition ability [184]. Very highly enantioselective reactions because of its amines enantiomeric recognition ability [184]. Very reactions because of its amines enantiomeric ability [184]. Very similar compounds be highly enantioselective reactions because of recognition its amines enantiomeric recognition ability [184].can Very similar compounds can also synthesized directly from or similar compounds can be be also synthesizedor directly from maleopimaric maleopimaric or fumaropimaric fumaropimaric acid acid [201]. [201]. also synthesized directly from maleopimaric fumaropimaric acid [201]. similar compounds can be also synthesized directly from maleopimaric or fumaropimaric acid [201]. O O O O O O COO COO COO O O O Methyl Methyl maleopimarate maleopimarate Methyl maleopimarate OH OH OH OH OH OH NaBH NaBH44 NaBH4 dioxane dioxane dioxane 0.5h 0.5h 0.5h COO COO COO O O O O O O NaH NaH NaH in in THF THF in THF 50h 50h 50h Rosin-based Rosin-based diol diol (yield: (yield: 53%) 53%) Rosin-based diol (yield: 53%) O O O O O O O O O O O O COO COO COO Rosin-derived Rosin-derived Rosin-derived binaphthyl-appended binaphthyl-appended 22-crown-6 22-crown-6 ether ether binaphthyl-appended 22-crown-6 ether Scheme Scheme 37. 37. Synthesis Synthesis of of rosin-derived rosin-derived binapthyl-appended binapthyl-appended 22-crown-6 22-crown-6 ether. ether. Scheme Scheme 37. 37. Synthesis Synthesis of of rosin-derived rosin-derived binapthyl-appended binapthyl-appended 22-crown-6 22-crown-6 ether. ether. 3.2.5. 3.2.5. Biologically Biologically Active Active Compounds Compounds 3.2.5. Biologically Active Compounds Biologically Active Compounds Pure abietic acid isolated from rosin and its derivatives exhibit many potential activities of Pure abietic abietic acid acid isolated isolated from from rosin rosin and and its its derivatives derivatives exhibit exhibit many many potential potential activities activities of of Pure interest to the pharmaceutical industry, for example, antitumor, anti-inflammatory, antimycotic and interest to the pharmaceutical industry, for example, antitumor, anti-inflammatory, antimycotic and interest tothe thepharmaceutical pharmaceuticalindustry, industry, example, antitumor, anti-inflammatory, antimycotic to forfor example, antitumor, anti-inflammatory, antimycotic and anti-arteriosclerotic properties and uses in treating digestive canal, acute and chronic gastritis, and anti-arteriosclerotic properties and uses in treating digestive canal, acute and chronic gastritis, and and anti-arteriosclerotic properties and uses in treating digestive and chronic gastritis, anti-arteriosclerotic properties and uses in treating digestive canal,canal, acuteacute and chronic gastritis, and erosive gastritis, allergy, asthma, arthritis and psoriasis [202]. In this subsection rosin-based chemicals erosive gastritis, allergy, asthma, arthritis and psoriasis [202]. In this subsection rosin-based chemicals and erosive gastritis, allergy, asthma, arthritis and psoriasis In this subsection rosin-based erosive gastritis, allergy, asthma, arthritis and psoriasis [202]. In[202]. this subsection rosin-based chemicals with main applications as biologically active compounds can be found. They include both with main applications as biologically active compounds can be found. They include both chemicals main applications as biologically compounds found.They Theyinclude include both with mainwith applications as biologically active active compounds can can be be found. medications and biocides. Their synthetic routes are usually characterized in detail and, from the medications and biocides. Their synthetic routes are usually characterized in detail and, from the medications and and biocides. biocides. Their Their synthetic synthetic routes routes are are usually usually characterized characterized in in detail detail and, and, from the medications chemical point of view, their TRLs are rather high. It is worth noting, that although the sustainability chemical point of view, their TRLs are rather high. It is worth noting, that although the sustainability chemical point of view, their TRLs are rather high. It is is worth worth noting, noting, that that although although the the sustainability sustainability of of their their syntheses syntheses is is usually usually worse worse than than for for other other rosin rosin derivatives derivatives (due (due to to the the necessity necessity of of using using more more of their syntheses is usually worse than for other rosin derivatives (due to the necessity of using more dangerous dangerous chemicals), chemicals), it it is is still still better better than than their their petrochemical petrochemical counterparts counterparts (thanks (thanks to to the the use use of of biobiodangerous chemicals), it is still better than their petrochemical counterparts (thanks to the use of biobased rosin as a main substrate). based rosin as a main substrate). based rosin as a main substrate). Methyl dehydroabietate is a white solid. It can be prepared from dehydroabietyl chloride and methanol according to Scheme 38, prior to vacuum evaporation and recrystallization [141]. It can be used as a substrate in the synthesis of antimicrobial agents and medicines [141,150]. Methyl 7-oxodehydroabietate is a yellow oil. It can be prepared from methyl dehydroabietate and chromium trioxide according to Scheme 38, followed by extraction, drying and column Molecules 2019, 24, 1651 19 of 52 chromatography [141]. It can be used as a substrate in synthesis of antimicrobial agents and medicines Molecules 2019, 24, x FOR PEER REVIEW 19 of 51 [141,150]. dangerous chemicals),acid it isderivative still better QC4 than can theirbe petrochemicalfrom counterparts (thanks to the use of Dehydroabietic methyl 7-oxodehydroabietate, Methyl dehydroabietate is a white solid. It can prepared be prepared from dehydroabietyl chloride and bio-based rosin as a main substrate). phenylhydrazine hydrochloride, 1,2-dibromoethane and N-methyl piperazine, according methanol according to Scheme 38, prior to vacuum evaporation and recrystallization [141].toItScheme can be Methyl dehydroabietate is a white solid. It canand, be prepared from dehydroabietyl chloride and 38 [141,150]. It shows antimicrobial properties [150] moreover, induces gastric cancer cell death used as a substrate in the synthesis of antimicrobial agents and medicines [141,150]. methanol according to Scheme 38, prior to vacuum evaporation and recrystallization [141]. It can via oncosis apoptosis [151]. Another dehydroabietic derivativefrom QC2methyl is reported to be ablebe to Methyland 7-oxodehydroabietate is a yellow oil. It canacid be prepared dehydroabietate used as a substrate in the synthesis of antimicrobial agents and medicines [141,150]. inhibit skin cancer cell lines [203]. and chromium trioxide according to Scheme 38, followed by extraction, drying and column chromatography [141]. It can be used as a substrate in synthesis of antimicrobial agents and medicines CrO3 COO Dehydroabietyl HN NH2 [141,150]. N chloride 3COO)2O QC4 can be prepared from methyl 7-oxodehydroabietate, Dehydroabietic acid (CH derivative CH3OH CH3COOH O phenylhydrazine hydrochloride, 1,2-dibromoethane and N-methyl according to Scheme N Br(CH2piperazine, )2Br 25°C/12h H N 38 [141,150].2hIt shows antimicrobial properties [150] and, moreover, induces gastric cancer cell death HCl K CO 2 3 TBAB via oncosis and apoptosis [151]. Another dehydroabietic acid derivative QC2 to in EtOH KI is reported to be able NaOH N 4h COO [203]. COO in CH3CN 25°C inhibit skin cancer cell lines Methyl Methyl 7-oxoyield: yield: N yield: COCl dehydroabietateCrO dehydroabietate 61% QC4 3 56% COO 18-67% Dehydroabietyl yield: 92% HN NH2 yield: 64% N chloride (CH COO) O 3 2 Scheme 38. Synthesis Synthesis of of dehydroabietic dehydroabietic derivative QC4. QC4. Scheme 38. derivative CH3COOH O CH3OH Br(CH2)2Br 25°C/12h 2h N H N Methyl 7-oxodehydroabietate is a yellow oil. It can be their prepared from methyl dehydroabietate N-(2-methyl-naphthyl)maleopimaric acid diimides and methyl esters are white solids (m.p. HCl K 2CO3 TBAB in EtOH KI NaOH and chromium trioxide to Scheme 38, followed acid, by extraction, drying and column 215-290°C). They can beaccording synthesized from maleopimaric 2-methyl-1-naphtylamine N and 4h COO COO in CH3CN 25°C chromatography [141]. It can be used as a substrate in synthesis of antimicrobial agents and dimethyl sulfate according to Scheme 39, and using separation methods such as extraction, washing, Methyl Methyl 7-oxoyield: yield: N yield: medicines [141,150]. drying, evaporation and recrystallization [106,107]. They show significant antitumor cytotoxicity dehydroabietate 61% COCl dehydroabietate QC4 56% 18-67% yield:acid 92% yield: 64% Dehydroabietic derivative QC4 can beNCI prepared methyl 7-oxodehydroabietate, against several human cancer cell lines, especially cells andfrom MGC-803 cells [106]. phenylhydrazine hydrochloride, 1,2-dibromoethane and N-methyl piperazine, accordingthey to Anticancer effects of various rosin derivatives, especially thioureas, were also investigated; Scheme 38. Synthesis of dehydroabietic derivative QC4. Scheme [141,150]. Itcytotoxicity shows antimicrobial properties [150] and, moreover, induces showed38 significantly toward diverse human carcinoma cell lines [108].gastric cancer cell deathN-(2-methyl-naphthyl)maleopimaric via oncosis and apoptosis [151]. Another dehydroabietic acid derivative is reported to be acid diimides and their methyl esters QC2 are white solids (m.p. R R O NH 2 able to inhibit skin cancer cell lines [203]. 215-290°C).O They can be synthesized from maleopimaric acid, 2-methyl-1-naphtylamine and N N N-(2-methyl-naphthyl)maleopimaric acid diimides and their methyl are white solids O using O esters O O (CH dimethyl sulfateO according to Scheme 39, and separation methods such as extraction, washing, 3)2SO4 ◦ R= or (m.p. 215–290 C). They can be synthesized from maleopimaric acid, 2-methyl-1-naphtylamine and drying, evaporation and recrystallization [106,107]. They show significant antitumor cytotoxicity K2CO3 dimethyl sulfate according to Scheme 39, and using separation methods such as extraction, washing, (C2H 5)3N against several human cancer cell lines, especially in NCI cells and MGC-803 cells [106]. acetone hexamethyl disilazane drying, evaporation and recrystallization [106,107]. They significant cytotoxicity reflux, 6h show Anticancer effects of various rosin derivatives, especially thioureas, wereantitumor also investigated; they in DMF against several human cancer cell lines, especially NCI cells and MGC-803 cells [106]. COOH COO reflux, 4h showed significantly cytotoxicity toward diverse human carcinoma cell lines [108]. COOH O Maleopimaric O acid NH2 O R (2-methyl-naphthy) N maleopimaric acid diimides O O (CH3)2SO4 yield: 30-41% R (2-methyl-naphthy) methyl N maleopimaric Oacid diimides O yield: 46-53% R = or K2CO3 (C2H39. 5)3NSynthesis of N-(2-methyl-naphthyl)maleopimaric Scheme acid diimides. in acetone hexamethyl disilazane reflux, 6h in DMF Thiadiazole amides of dehydroabietic or acrylpimaric COO acids can COOH reflux, 4h COOH group-containing be prepared from adequate rosin acid, thiosemicarbazide and an acyl chloride according to Scheme 40, and using such separation methods as filtration, vacuum drying, recrystallization and column chromatography Maleopimaric (2-methyl-naphthy) (2-methyl-naphthy) methyl [130]. applied as insecticides [130,190]. acid They can be potentiallymaleopimaric acid diimides maleopimaric acid diimides yield: 30-41% yield: 46-53% Scheme 39. 39. Synthesis N-(2-methyl-naphthyl)maleopimaric acid acid diimides. diimides. Scheme Synthesis of of N-(2-methyl-naphthyl)maleopimaric Thiadiazoleeffects group-containing amides of dehydroabietic acrylpimaric acidsinvestigated; can be prepared Anticancer of various rosin derivatives, especially or thioureas, were also they from adequate rosin acid, thiosemicarbazide and human an acyl carcinoma chloride according Scheme 40, and using showed significantly cytotoxicity toward diverse cell linesto [108]. suchThiadiazole separation methods as filtration, vacuum drying, recrystallization andacids column chromatography group-containing amides of dehydroabietic or acrylpimaric can be prepared from [130]. They can acid, be potentially applied asand insecticides [130,190]. adequate rosin thiosemicarbazide an acyl chloride according to Scheme 40, and using such separation methods as filtration, vacuum drying, recrystallization and column chromatography [130]. They can be potentially applied as insecticides [130,190]. in POCl3 reflux, 4h (C2H5)3N in CH2Cl2 0°C, 12h COOH O NH H2N S Dehydroabietic acid amide with thiadiazole group yield:78-86% Molecules 2019, 24, x FOR PEER REVIEW S NH2 Scheme 40. O N R Cl H R in P OCl3 reflux, 4h N N Dehydroabietic acid 2019, 24, 1651 Molecules N H COOH Acrylpimaric acid O O R (C2H5)3N in CH2Cl2 0°C, 12h NH S N N 20 of 52 Acrylpimaric acid amide with 20 of 51 thiadiazole groups yield:58-85% Synthesis of rosinRacid amides with thiadiazole groups. = {-CH 3, -C6H11, -C6H5, -C6H5R' } R R Cl N COOH N NH S H2N O Acrylpimaric acid-based aromatic diacylthioureas can SbeNHprepared from acrylpimaryl 2 O O in POCl3 (C H ) N 2 5 3 NH R dichloride, potassium thiocyanate and aromatic amines according to Scheme 41, prior to vacuum N O H2N R Cl reflux, 4h H in CH2Cl2 S They may be applied as botanical herbicides showingRhigher evaporation and recrystallization [129]. in P OCl 0°C, 12h (C2H5)3N 3 COOH N NH reflux, 4h activity than similar dicarboxamide, dihydrazone and diimide compounds [129]. Moreover, some in CH2Cl N 2 S 0°C,Staphylococcus 12h Dehydroabietic Dehydroabietic acidactivities against acrylpimaryl diimides possess antibacterial Gram-positive aureus and COOH N acid amide with thiadiazole Gram-negative Escherichia coli [204]. Furthermore, some acrylpimaryl dicarboxamidesN show Acrylpimaric Acrylpimaric acid amide with group yield:78-86% antibacterial properties against E. coli, whereas their Gram-positive bacteria was acid activity against thiadiazole groups yield:58-85% significantly lower [205]. Scheme 40. of amides thiadiazole Solid acrylpimaryl quaternary ammonium salts canwith be synthesized from acrylpimaryl acid, Scheme 40. Synthesis Synthesis of rosin rosin acid acid amides with thiadiazole groups. groups. oxalyl chloride, epichlorohydrin and volatile tertiary amines according to Scheme 41 and using such Acrylpimaric acid-basedaromatic aromatic diacylthioureas be prepared from acrylpimaryl Acrylpimaric acid-based diacylthioureas can and becan prepared from acrylpimaryl dichloride, separation methods as vacuum distillation, extraction recrystallization [189]. They show dichloride, potassium thiocyanate and aromatic aminestoaccording to prior Scheme 41, priorevaporation to vacuum potassium thiocyanate and aromatic amines according Scheme 41, to vacuum fungicidal activity and can be applied in wood preservation [189]. Very similar acrylpimaryl evaporation and recrystallization [129]. mayasbe applied herbicides as botanical herbicides showing higher and recrystallization [129]. They may beThey applied botanical showing higher activity than materials that can be applied as surfactants were also prepared [133]. Another fungicidal rosin-based activity than similar dicarboxamide, dihydrazone and diimide compounds [129]. Moreover, some similar dicarboxamide, dihydrazone and diimide [129]. Moreover, acrylpimaryl materials can be prepared in similar way fromcompounds rosin, epichlorohydrin and some amines [134–136]. acrylpimaryl diimides possessactivities antibacterial activities against Gram-positive Staphylococcus aureus and diimides possess antibacterial against Gram-positive Staphylococcus aureus and Gram-negative Maleopimaryl chloride is a yellowish solid. It can be prepared from maleopimaric acid and oxalyl (or Gram-negative Escherichia coli [204]. some acrylpimaryl dicarboxamides show Escherichia coli [204]. Furthermore, some30Furthermore, acrylpimaryl dicarboxamides show antibacterial thionyl) chloride, according to Scheme or 42, prior to vacuum distillation and washingproperties [104,105]. antibacterial properties against E. coli, whereas their activity against Gram-positive bacteria against E. coli, whereas their activity against Gram-positive bacteria was significantly lower [205].was It can be used as an intermediate in preparation of surfactants [104] or fungicides [105]. significantly lower [205]. Solid acrylpimaryl quaternary ammonium salts can be synthesized from acrylpimaryl acid, Acrylpimaryl diacarboxamide Acrylpimaryl diacylthiourea R = {-H, -CH3, -(CH3)2, -OCH3, , -F, -Cl, -Br, -OH, -NO } -CF oxalyl chloride, epichlorohydrin and volatile tertiary amines according to Scheme 41 and using such compound yield:58-85% compound yield:60-77% 3 2 O O S separation methods as vacuum distillation, extraction and recrystallization [189]. They show NH2 1. KSCN [189]. Very similar Cacrylpimaryl C fungicidal activity and can be applied in wood preservation N R HN NH H materials that can be applied as surfactants were also prepared [133]. Another fungicidal rosin-based R 2. H2N materials can be prepared in similar way from rosin, epichlorohydrin and amines R[134–136]. COCl Maleopimaryl chloride is a yellowish from maleopimaric acid and oxalyl (or (C2H5)3Nsolid. It can be prepared in acetonitrile R H Cand NH washing 25°C, 4h in CH Cl ; <5°C, 12h thionyl) chloride, according to 2Scheme 30 or 42, prior to vacuum distillation [104,105]. N C 2 N H O R R O It can be used as an intermediate in preparation of surfactants 1.[104] or fungicides [105]. S NH3*H2O O N C Acrylpimaryl diacarboxamide N H compound yield:58-85% O HN C R R = {-H, -CH3, -(CH3)2, -OCH3, COCl -NO2 } -CF3, -F, -Cl, -Br, -OH, R NH2 C 1. in THF 2. in EtOH 0-25°C, 17hR R N H 1. N2H4 2. CHO N O Acrylpimaryl dihydrazone (C2H5)3N R in CH2Cl2; <5°C, 12h compound yield:45-60% N C R H Acrylpimaryl chloride COCl 2. LiAlH4 3. CHO R Acrylpimaryl diacylthiourea N compound yield:60-77% O 1. KSCN R 1. in THF 2. in THF 2. H23.N in EtOH 0-25°C, 17h O in acetonitrile 25°C, 4h R C S N H NH R R N Acrylpimaryl diimide H C NH compound Nyield: 22-59% O S R 1. diacylthioureas, NH3*H2O Scheme 41.O Synthesis acid-based dicarboxamides, Scheme 41. Synthesis ofof acrylpimaric acrylpimaric acid-based aromatic aromatic diacylthioureas, dicarboxamides, 1. N2H4 2. LiAlH 4 2. N dihydrazones and diimides. CHO 3. CHO dihydrazones C and diimides. N H COCl N R R Solid acrylpimaryl quaternary ammonium salts can be synthesized from acrylpimaryl acid, Acrylpimaryl R oxalyl chloride, epichlorohydrin and volatilechloride tertiary amines according to Scheme 41 and using such R 1. in THF 1. in THF R separation methods as vacuum distillation, extraction and recrystallization [189]. They show fungicidal 2. in EtOH 2. in THF R C N N 0-25°C, preservation 17h in EtOHacrylpimaryl materials that can activity Hand can be applied in wood [189]. Very 3.similar N 0-25°C, 17h O be applied as surfactants were also prepared [133]. Another fungicidal rosin-based materials can be Acrylpimaryl dihydrazone Acrylpimaryl diimide prepared in similar way from rosin, epichlorohydrin and amines [134–136]. Maleopimaryl chloride is a compound yield:45-60% compound yield: 22-59% yellowish solid. It can be prepared from maleopimaric acid and oxalyl (or thionyl) chloride, according Scheme30 41. Synthesis acrylpimaric aromatic diacylthioureas, to Scheme or Scheme 42,ofprior to vacuumacid-based distillation and washing [104,105]. dicarboxamides, It can be used as an dihydrazones and diimides. intermediate in preparation of surfactants [104] or fungicides [105]. Molecules 2019, 24, 1651 21 of 52 Molecules 2019, 2019, 24, 24, xx FOR FOR PEER PEER REVIEW REVIEW Molecules 21 of of 51 51 21 COCl COCl COCl R == = CH CH33 or or CH CH CH CH R R CH 3 or CH222CH333 COO COO COO OH OH OH 1.NaOH NaOH 1. 1. NaOH 2. 2. 2. O O O Cl Cl Cl in CH CH222Cl Cl222 in 50°C, 4h 4h 50°C, COCl COCl COCl Cl Cl Cl OH OH OH COO COO COO Acrylpimaryl dichloride dichloride Acrylpimaryl R R R R R R N N N COO COO COO OH OH OH R R R OH OH OH (C222H H555))333N N (C in alcohol alcohol in 85°C, 3.5h 3.5h 85°C, Cl Cl Cl R R R N N N COO COO COO Cl Cl Cl R R R N R R N R R N R R R R R Cl Cl Cl R R R Acrylpimaryl quaternary quaternary Acrylpimaryl ammonium salt salt yield: yield: 71-82% 71-82% ammonium Scheme 42. 42. Synthesis Synthesis of acrylpimaryl acrylpimaryl quaternary quaternary ammonium ammonium salts. salts. Scheme Synthesis of of acrylpimaryl quaternary ◦ Maleated rosin-based dithioureacompounds compoundsare areyellow yellowsolids solids(m.p. (m.p.162–216 162–216 They rosin-based dithiourea dithiourea compounds are yellow solids (m.p. 162–216 °C).C). They cancan be Maleated °C). They can be be prepared from maleated rosin acyl chloride, hydrazine and substituted benzoyl isothiocyanates, prepared from from maleated maleated rosin rosin acyl acyl chloride, chloride, hydrazine hydrazine and and substituted substituted benzoyl benzoyl isothiocyanates, prepared according to to Scheme Scheme 43, 43, and and using separation methods such as rotary recrystallization and using using separation separation methods methods such such as as rotary rotary evaporation, evaporation, recrystallization recrystallization according evaporation, and column chromatography [105]. They can be potentially used as fungicides [105]. column chromatography [105]. potentially used as fungicides [105]. and column chromatography [105]. They can be potentially used as fungicides [105]. O O O O O O O O O O O O O O O O O O O O O N22H H ** H HO O N N 2H444* H222O in benzene benzene in <80°C, 5h 5h <80°C, in CH CH222Cl Cl222 in 0-25°C, 4h 4h 0-25°C, Maleated rosin rosin Maleated R == = {{{ H; H; -CH -CH33;;; -OCH -OCH ;; -Cl -Cl }} R R H; -CH 3 -OCH333; -Cl } O O O O O O NCS NCS NCS N N N R R R NH22 NH NH 2 COCl COCl COCl C C C NH NH NH O O O in acetonitrile acetonitrile in reflux, 44hh reflux, C C C O O O O O O Maleated rosin rosin Maleated acyl chloride chloride acyl yield: 85% 85% yield: R R R N N N O O O O O O Cl S S Cl Cl Cl Cl S Cl COOH COOH COOH NH22 NH NH 2 Maleated rosin rosin Maleated hydrazide yield: yield: 75% 75% hydrazide H H H N N N N N N H H H O O O H H H N N N NH NH NH S S S H H H N N N S S S O O O R R R Maleated rosin-based rosin-based Maleated dithiourea dithiourea Scheme 43. Synthesis Synthesis of maleated maleated rosin-based dithiourea dithiourea compounds. Scheme Scheme 43. 43. Synthesis of of maleated rosin-based rosin-based dithiourea compounds. compounds. be prepared prepared from from dehydroabietic dehydroabietic acid acid and and glucose glucose according according to to Glucose Glucose dehydroabietate dehydroabietate can can be Scheme 44 44 prior prior to to vacuum vacuum distillation, distillation, filtration filtration and and washing washing [206]. [206]. Its Its potential potential application is as as aa Scheme application is surfactant in in food food industry industry [206]. [206]. surfactant OH OH OH HO HO HO OH OH OH KOH KOH in propanediol propanediol in 190°C, 6h 6h 190°C, COOH COOH COOH HO HO HO OH OH OH HO HO HO Dehydroabietic Dehydroabietic acid acid Glucose dehydroabietate dehydroabietate Glucose yield: 51% 51% yield: OH OH OH COO COO COO OH OH OH OH OH OH Scheme 44. 44. Preparation Preparation of glucose glucose dehydroabietate. dehydroabietate. Scheme Scheme 44. Preparation of of glucose dehydroabietate. Acrylic rosin rosin cyclic cyclic diamide diamide is is aa solid. solid. It It can can be be prepared prepared from from acrylpimaric acrylpimaric acid acid and and diethylene diethylene Acrylic triamine according to Scheme 45 prior to washing and drying [131]. It can be used as a fungicide for Scheme 45 prior prior to to washing washing and and drying drying [131]. [131]. It can be used as a fungicide for triamine according to Scheme wood preservation preservation [131]. [131]. wood preservation [131]. COOH COOH COOH Acrylpimaric Acrylpimaric acid acid C O O C C O NH NH NH H22N(CH N(CH )) NH(CH NH(CH )) NH NH H H 2N(CH222)222NH(CH222)222NH222 xylene xylene <180°C, 8h 8h <180°C, COOH COOH COOH C NH C NH C NH O O O NH NH NH Scheme 45. Preparation of of acrylic acrylic rosin rosin cyclic cyclic diamide. diamide. Scheme 45. Preparation 3.2.6. Other Other Small/Medium Small/Medium Molecule Molecule Products Products 3.2.6. Acrylic rosin rosin Acrylic cyclic diamide diamide cyclic Molecules 2019, 24, x FOR PEER REVIEW 22 of 51 Molecules 2019, 24, 1651 22 of 52 Hydroabietic acid can be prepared from rosin and hydrogen using palladium/SBA-15 mesoporous silica catalyst, according to Scheme 46 [207]. This catalyst is more efficient than others [208,209] Its Small/Medium applications oxidation-resistant solvent-borne tackifiers and coatings, a substrate Molecules 2019, 24, x FOR PEERinclude REVIEW 22 of 51 3.2.6. Other Molecule Products for esterification with glycerol [210], additives for polyvinylidene difluoride binders for lithium Hydroabietic acid beIt prepared from hydrogen using epoxy palladium/SBA-15 mesoporous Hydroabietic acidcan can be be prepared fromand rosin and liquid hydrogen using titanium oxide anodes [76]. can used inrosin high-performance resinspalladium/SBA-15 [83], for synthesis silica catalyst, according to Scheme 46 [207]. This catalyst is more efficient than others [208,209] mesoporous silicapolyurethane catalyst, according to[173]. Scheme [207]. This catalyst is more efficient than others of high adhesion acrylate It is46noteworthy, that non-catalytic decarboxylation of Its applications include oxidation-resistant solvent-borne tackifiers and coatings, a substrate for [208,209] Its applications include oxidation-resistant solvent-borne tackifiers and coatings, a substrate rosin can take place at temperatures above 200 °C, and the main product of such decomposition is esterification withwith glycerol [210],[210], additives for polyvinylidene difluoride binders binders for lithium for esterification glycerol additives for polyvinylidene difluoride fortitanium lithium norabieta-8,11,13-triene [211]. oxide anodes [76]. It can be used in high-performance liquid epoxy resins [83], for synthesis of titanium oxide anodes [76]. It can be used in high-performance liquid epoxy resins [83], for synthesis high adhesion polyurethane acrylate of of high adhesion polyurethane acrylate[173]. [173].ItItisisnoteworthy, noteworthy,that thatnon-catalytic non-catalytic decarboxylation decarboxylation of H2 ◦ C, and the main product of such decomposition is rosin can take place at temperatures above 200 rosin can take place at temperatures above 200 °C, and the main product of such decomposition is > 200°C Pd/SiO 2 norabieta-8,11,13-triene [211]. norabieta-8,11,13-triene [211]. in ethanol Norabieta160°C,8MPa,4h Hydroabietic acid -8,11,13-triene COOH Rosin COOH yield: >97% H2 > 200°C Scheme 46. Hydrogenation of rosin to hydroabietic acid. Pd/SiO 2 in ethanol 160°C,8MPa,4h Hydroabietic acid Norabieta-8,11,13-triene Rosin-based standard-quality biodiesel can be prepared in a catalyst-free process from darkCOOH Rosin COOH yield: >97% grade rosin, heavy turpentine and supercritical methanol in supercritical CO2 as a green medium. Yields >93% were obtained after 46. 3 hHydrogenation at 340 °C, under a pressure of 11 MPa [212]. Yield of >85% can be Scheme of to acid. Scheme 46. Hydrogenation of rosin rosin to hydroabietic hydroabietic acid. achieved using Pt/mesoporous aluminosilicate catalyst after 4 h at 300–350 °C, 5 MPa [213]. A yield standard-quality biodiesel can be prepared a after catalyst-free process standard-quality biodiesel can be prepared in aincatalyst-free from dark-grade >99%Rosin-based can be achieved using Ni/layered double hydroxide catalyst <2 hprocess at 190 °C, 5 from MPa dark[214]. grade rosin, heavyofturpentine and supercritical methanol supercritical CO 2medium. as a green medium. rosin, heavy turpentine and is supercritical methanol inout supercritical CO2 as a green Yields >93% Catalytic cracking rosin also possible to carry usinginacid-activated montmorillonite [215]. ◦ C, Yields >93% were obtained after at 340a °C, underlevopimaric a pressure of 11 MPa Yieldcan ofaccording >85% can be were obtained after 3 h at 340 under pressure of 11 MPa [212]. Yield[212]. of >85% be achieved Acrylpimaryl nitrile can be3 h prepared from acid and acrylonitrile to ◦ achieved using Pt/mesoporous aluminosilicate catalyst 4 h atC, 300–350 MPa A yield using Pt/mesoporous aluminosilicate catalyst 4 h atafter 300–350 5ItMPa [213]. A yield >99% can Scheme 47, prior to extraction, filtration and after precipitation [216,217]. can°C, be 5used in[213]. synthesis of >99% can be using achieved using Ni/layered double hydroxide catalyst h at 190 °C, 5 MPa [214]. be achieved Ni/layered double hydroxide catalyst <2 h after at 190<2◦ C, 5 MPa [214]. Catalytic diacrylpimaryl ketone and acrylpimaryl amidoxime [217].after Catalytic cracking of rosin is also possible to carry out using acid-activated montmorillonite [215]. cracking of rosin is also possible to carry out using acid-activated montmorillonite [215]. Acrylpimaryl nitrile amidoximes can be prepared from adequate acrylpimaryl nitriles and Acrylpimaryl nitrile be prepared to Acrylpimaryl nitrile can from levopimaric acid and acrylonitrile hydroxylamine according to Scheme 47, prior to precipitation, washing, filtration andaccording drying [217] Scheme 47, can priorbetoused It be of extraction, filtration andthin precipitation It can cannanoparticles be used in synthesis [218]. They to prepare bioactive films filled[216,217]. by magnetite for oil spill diacrylpimaryl and acrylpimaryl amidoxime [217]. collecting [217] ketone and thorium ions removal [218]. Acrylpimaryl nitrile amidoximes can be prepared from adequate acrylpimaryl nitriles and O and drying [217] O hydroxylamine according to Scheme 47, priorOto precipitation, washing, filtration ( ) 3 N N [218]. They can be used 2. Triethylene4. NHto 2OHprepare bioactive thin films filled by magnetite nanoparticles for oil spill H H collecting tetramine [217] and thorium ions removal [218]. 70°C, 2h in toluene 10°C, 24h O 1. Oxalyl chloride in toluene 50°C, 4h 3. CNN in DMF 185°C, 12h CN 185°C, 12h N HOOC C N OH H2N C H2N NH2OH 70°C 4h HOOC H2N N OH HO Diacrylpimaryl nitrile amidoxime ketone HO H2N N OH O N sulfonic acid; in toluene p-toluene Diacrylpimaryl 235°C, NH2 4h Diacrylamidoxime triethylenetetralevopimaramide nitrile amidoxime ketone C C N NH2 NH2OH 70°C, 4h HO N NH2 NH2OH 70°C, 4h O p-toluene sulfonic acid; in toluene N OH 235°C, 4h COOH Levopimaric Acrylpimaryl nitrileH2N acid 185°C, 12h yield: 78%NH2OH CNHOOC O O 1. Oxalyl 3. N( N )3 NH2OH 2. Triethylene4.CN H H HO OH chloridetetramine N N in DMF 70°C, 2h NH H N in toluene 185°C, 12h 2 in toluene Diacrylamidoxime 2 50°C, 4h 10°C, 24h triethylenetetralevopimaramide Acrylpimaryl amidoxime CN CN Diacrylpimaryl nitrile ketone yield: 80% 70°C of Nacrylpimaryl Scheme 47. 47. Synthesis nitrile and and acrylpimaryl amidoximes. OH COOH Scheme Synthesis of acrylpimaryl nitrile acrylpimaryl CNamidoximes. 4h CN HOOC Levopimaric Acrylpimaryl Diacrylpimaryl nitrile Acrylpimaryl nitrilecan be acidAcrylpimaryl amidoxime Rosin-oil dimernitrile acids amidoximes mixture from rosin industrial fatty oils according to canprepared be prepared from and adequate acrylpimaryl nitriles and ketone yield: 80% yield: 78% Scheme 48, prior to washing and rotary evaporation [219]. It washing, can be used for preparation a liquid hydroxylamine according to Scheme 47, prior to precipitation, filtration and dryingof[217,218]. Scheme 47. Synthesis of acrylpimaryl nitrile and acrylpimaryl amidoximes. Rosin-oil dimer acids mixture can be prepared from rosin and industrial fatty oils according to Scheme 48, prior to washing and rotary evaporation [219]. It can be used for preparation of a liquid Molecules 2019, 24, 1651 23 of 52 They can be used to prepare bioactive thin films filled by magnetite nanoparticles for oil spill 23 of 51 removal [218]. 23 of of 51 51 23 Rosin-oil dimer acids mixture can be prepared from rosin and industrial fatty oils according to thermal stabilizer [219]. It is noteworthy, that dimerized rosin is usually produced separately and can Scheme 48, prior to washing and[220,221] rotary evaporation [219]. It can be used for preparation of stability aand liquid thermal stabilizer [219]. It is is noteworthy, noteworthy, that dimerized rosin is usually usually produced separately can thermal stabilizer [219]. It that dimerized rosin is produced and can be applied in acrylic adhesives to improve their wetting, adhesion andseparately thermal thermal stabilizer [219]. It is noteworthy, that dimerized rosin is usually produced separately and can be applied applied in in acrylic acrylic adhesives adhesives [220,221] [220,221] to to improve improve their their wetting, wetting, adhesion adhesion and and thermal thermal stability stability be [220]. be applied in acrylic adhesives [220,221] to improve their wetting, adhesion and thermal stability [220]. [220]. [220]. Molecules 2019, 24, x FOR PEER REVIEW collecting [217] ions Molecules 2019, 2019, 24, xxand FORthorium PEER REVIEW REVIEW Molecules 24, FOR PEER HOOC CH3(CH2)5 (CH2)7COOH (CH22))55 CH33(CH CH fatty acids HOOC HOOC (CH22))77COOH COOH (CH (CH2)7CH3 fatty acids acids fatty catalyst (CH22))77CH CH33 (CH 240°C,0.5MPa,5h catalyst catalyst 240°C,0.5MPa,5h 240°C,0.5MPa,5h COOH COOH COOH (CH22))77COOH COOH (CH COOH COOH COOH Rosin Rosin Rosin COOH (CH2)7COOH COOH COOH COOH Mixture of rosin-oil dimer acids Mixture of of rosin-oil rosin-oil dimer dimer acids acids Mixture COOH COOH Scheme 48. Preparation of rosin-oil dimer acids mixture. Scheme 48. 48. Preparation Preparation of of rosin-oil rosin-oil dimer dimer acids acids mixture. mixture. Scheme Scheme Solid rosin-based chain extender for polyurethanes can be synthesized from rosinSolid rosin-basedacid, chain extender for polyurethanes can be synthesized from Solid rosin-based rosin-based chain extender forand polyurethanes can be synthesized synthesized from rosinSolid chain extender for polyurethanes can be from maleimidodicarboxylic thionyl chloride ethylene glycol, according to Scheme 49, and rosinusing rosin-maleimidodicarboxylic acid, thionyl chloride and ethylene glycol, according 49, maleimidodicarboxylic acid, thionyl chloride and ethylene ethylene glycol, according to Scheme 49,Scheme and using using maleimidodicarboxylic acid, chloride and glycol, according to Scheme 49, and such separation methods as thionyl vacuum distillation, washing and evaporation [186]. Its to application in and using such separation methods as vacuum distillation, washing and evaporation [186]. Its application such separation methods as vacuum distillation, washing and evaporation [186]. Its application in such methods as vacuum distillation, washing and evaporation [186]. application in shapeseparation memory polyurethanes improves shape recovery at >1000% strain up to 96%Its [186]. in shape memory polyurethanes improves shape recovery at >1000% strain up to 96% [186]. shape memory memory polyurethanes polyurethanes improves improves shape shape recovery recovery at at >1000% >1000% strain strain up up to to 96% 96% [186]. [186]. shape O O O Cl COOH Cl Cl DMF COOH 85°C, 5h COOH N NN O O O COOH COOH COOH O O Cl HO O S HO HO Cl SS Cl O OH pyridine OH inpyridine toluene pyridine 110°C, 5h in toluene in toluene 110°C, 5h 5h 110°C, DMF DMF 85°C, 5h 5h Rosin-maleimido-85°C, dicarboxylic acid Rosin-maleimidoRosin-maleimidodicarboxylic acid acid dicarboxylic O O O OH COOH N O O C NN O C C O O O COOH COOH O O HO HO HO Rosin-based chain Rosin-based Rosin-based extender chain chain extender extender Scheme 49. Synthesis of rosin-based chain extender for polyurethanes. Scheme 49. 49. Synthesis Synthesis of rosin-based chain chain extender extender for for polyurethanes. polyurethanes. Scheme Scheme 49. Synthesis of of rosin-based rosin-based chain extender for polyurethanes. Chiral thioureas and thiouronium salts containing dehydroabietyl groups are well characterized thiouronium containing dehydroabietyl well characterized characterized Chiral thioureas and thiouronium thiouronium salts containing dehydroabietyl groups are and salts dehydroabietyl well whiteChiral or thioureas yellow solids [222]. They can be prepared from groups chiralare amines (including or yellow solids [222]. They can be prepared from chiral amines (including dehydroabietylamine), white or yellow solids [222]. They can be prepared from chiral amines (including white or yellow solids [222]. They can be prepared from chiral amines (including dehydroabietylamine), carbon disulfide and butyl halides according to Scheme 50 and using such carbon disulfide and butyl halides according to Scheme 50 and using such separation methods as dehydroabietylamine), carbon disulfide and butyl halides according to Scheme 50 and using such dehydroabietylamine), carbon disulfide butyldrying, halidesevaporation according to Scheme 50chromatography and using such separation methods as filtration, washing,and vacuum and column filtration, washing, drying, evaporation anddrying, column chromatography [222]. can be useful separation methods as filtration, filtration, washing, vacuum drying, evaporation and column column chromatography separation methods as washing, vacuum evaporation and chromatography [222]. They can bevacuum useful for the physical separation of racemic mixtures [222]. They Moreover, rosinfor the physical separation of racemic mixtures [222]. Moreover, rosin-derived thioureas can be used as [222]. They can be useful for the physical separation of racemic mixtures [222]. Moreover, [222]. They can be useful for the physical separation of racemic mixtures [222]. Moreover, rosinderived thioureas can be used as enantioselective catalysts for many reactions [12]. In recent rosinyears enantioselective catalysts for many reactions [12]. In recent years these were: Michael addition [223,224], derived thioureas can be used as enantioselective catalysts for many reactions [12]. In recent years derived thioureas canaddition be used as enantioselective for many reactions In recent years these were: Michael [223,224], tandem catalysts Michael/cyclization sequence[12]. [225], asymmetric tandem Michael/cyclization sequence [225], asymmetric Michael/hemiketalization [226], these were: were: Michael addition addition [223,224], tandem Michael/cyclization sequence [225], [225], asymmetric these Michael [223,224], tandem Michael/cyclization sequence asymmetric Michael/hemiketalization [226], asymmetric aza-Henry reaction [227], asymmetric tandem reaction aza-Henry reaction [227], asymmetric tandem aza-Henry reaction [228], Mannich reaction [229,230], Friedel–Crafts Michael/hemiketalization [226], asymmetric asymmetric aza-Henry reaction [227], asymmetric tandem reaction Michael/hemiketalization [226], reaction [227], asymmetric tandem reaction [228], Mannich reaction [229,230], Friedel–Crafts alkylation [231], enantioand diastereoselective alkylation [231], enantioandasdiastereoselective addition [232], as well as synthesis of [228], Mannich Mannich reaction [229,230], Friedel–Crafts alkylation [231], enantioenantioand diastereoselective [228], reaction [229,230], alkylation [231], diastereoselective asymmetric addition [232], wellFriedel–Crafts as synthesisasymmetric of chiral amines [233] or and N-protected β-amino chiral amines [233] or N-protected β-amino malonates [234]. In recent studies rosin-derived thioureas asymmetric addition [232], as well as synthesis of chiral amines [233] or N-protected β-amino asymmetric addition [232], as well as synthesis of chiral amines [233] or N-protected β-amino malonates [234]. In recent studies rosin-derived thioureas are dominant majority of all investigated are dominant majority ofThey all investigated rosin-derived catalysts. Theyarticle are not explored further in malonates [234]. In recent recent studies rosin-derived thioureas are dominant majority of all all they investigated malonates [234]. In studies thioureas are majority of investigated rosin-derived catalysts. are rosin-derived not explored further in thedominant current because are the the current article because they arenot theexplored subject [12]. offurther a comprehensive review publication [12]. For rosin-derived catalysts. They are not explored further in the the current article because theycatalysts arenow, the rosin-derived catalysts. They are in current article because they are the subject of a comprehensive review publication For now, reports on another rosin-based subject of a comprehensive review publication [12]. For now, reports on another rosin-based catalysts reports on another rosin-based catalysts are rare [235–237]. subject of a comprehensive review publication [12]. For now, reports on another rosin-based catalysts are rare [235–237]. are rare rare [235–237]. [235–237]. are R' CS2 R' R' NH2 CS22 CS DCC in (CDCC 2H5)2O DCC NH22 NH <20°C, ) OO in (C HH )12h in (C 22 55 22 <20°C,12h 12h <20°C, R' R" S NH2 R' R" NH NH22 R' R" N C S in CH2Cl2 <20°C, 12h inCH CH22Cl Cl NN CC SS in 22 <20°C,12h 12h <20°C, SS C4H9 X CC44HH99 XX in C2H5OH N N R' H R" 65-90°C, 24 h H R" R' inCC22HH55OH OH in NN NN HH HH Chiral 65-90°C,24 24hh 65-90°C, R' R" thiourea Chiral Chiral yield: 76-91% thiourea thiourea yield: 76-91% 76-91% yield: S R' N R' H R' NN HH SS C4H9 CC44HH99 R" X N R" XX H R" NN HH Chiral thiouronium salt yield: 83-99.5% salt Chiral thiouronium salt Chiral thiouronium yield: 83-99.5% 83-99.5% yield: X = Cl or Br or I X = Cl Cl or or Br Br or I X R'=and/or R" = or I R' and/or R" = R' or and/or R" = or or Scheme 50. Synthesis Synthesis of of chiral chiral thioureas thioureas and their thiouronium salts. Scheme 50. 50. Synthesis Synthesis of of chiral chiral thioureas thioureas and and their their thiouronium thiouronium salts. salts. Scheme Optically pure rosin-based chiral alcohols and their phosphorus derivatizing agents are white Optically pure rosin-based chiral chiralmaleopimaric alcohols and and their theirin phosphorus derivatizing agents are white white Optically pure rosin-based alcohols phosphorus derivatizing agents are solids. They can be synthesized from acid two main ways according to Scheme 51 solids. They canseparation be synthesized synthesized from maleopimaric acid in in two main main ways according according to Scheme Scheme 51 51 solids. They can be from acid two ways to and using such methods asmaleopimaric washing, filtration, drying, evaporation, and recrystallization and using using such such separation separation methods methods as as washing, washing, filtration, filtration, drying, drying, evaporation, evaporation, and and recrystallization recrystallization and Molecules 2019, 24, 1651 24 of 52 Optically pure rosin-based chiral alcohols and their phosphorus derivatizing agents are white MoleculesThey 2019, 24, FOR PEER REVIEW 51 solids. canx be synthesized from maleopimaric acid in two main ways according to Scheme 24 51 of and Molecules 2019, 24, x FOR PEER REVIEW 24 of 51 using such separation methods as washing, filtration, drying, evaporation, and recrystallization [113]. [113]. They can be 31 used in 31P-NMR-based determination of enantiomeric excess in solutions They can be can usedbe in used P-NMR-based determination of enantiomeric excess in solutions containing [113]. They in 31amines P-NMR-based containing chiral alcohols and [113]. determination of enantiomeric excess in solutions chiral alcohols and amines [113]. containing chiral alcohols and amines [113]. O O O O 1. PCl3 O 2. PCl CH3OH 1. O 3. LiAlH 2. CH3OH 4 4. LiAlH PhCH(OCH 3. 3)2 4 4. PhCH(OCH3)2 CH2OH COOH COOH Maleopimaric Maleopimaric acid acid 1. PCl3 2. PCl CDCl 1. 3 3 / pyridine 3. CDCl Chiral3 diol or acid / pyridine 2. 4. Chiral S8 3. diol or acid 4. S8 O O O O Y = O or N Y = O or N CH2OH chiral alcohols Rosin-based Rosin-based alcohols yield: chiral 53-65% yield: 53-65% CH2 CH2 phosphorus Rosin-based chiral agens phosphorus derivatizing derivatizing agens 1. PCl3 2. PCl CDCl 1. 3 3 / pyridine 3. CDCl Chiral3 single alcohol / pyridine 2. or monoamine 3. Chiral single alcohol 4. or S8monoamine 4. S8 OH OH OH OH 1. SOCl2 / DMF 2. SOCl Piperidine 1. 2 / DMF 3. Piperidine LiAlH4 / THF 2. 3. LiAlH4 / THF S SP Y Y CH2O P Y CH2O Y Rosin-based chiral O O O O O O P O P O CH2 CH2 N N Y Y R R N N Scheme 51. Synthetic routes of rosin-based chiral alcohols and phosphorus derivatizing agents. Scheme Scheme 51. 51. Synthetic Synthetic routes routes of of rosin-based rosin-based chiral chiral alcohols alcohols and and phosphorus derivatizing agents. Rosin-based molecular glass photoresists can be prepared from maleopimaric acid, molecular glass photoresists can be prepared maleopimaric acid, hydroxylamine, Rosin-based molecular glass photoresists canchloride be from prepared from maleopimaric acid, hydroxylamine, 2-diazo-1-naphthoquinone-4-sulfonyl and unsaturated compounds: vinyl 2-diazo-1-naphthoquinone-4-sulfonyl chloride and unsaturated compounds: vinyl ethyl ether, or hydroxylamine, 2-diazo-1-naphthoquinone-4-sulfonyl chloride and unsaturated compounds: ethyl ether, or dihydropyran, or cyclohexyl vinyl ether, according to Scheme 52 and using vinyl such dihydropyran, or cyclohexyl vinyl ether, according toether, Scheme 52 and using such separation methods as ethyl ether, or dihydropyran, or cyclohexyl vinyl according to Scheme 52 and such separation methods as filtration, washing and vacuum drying [114]. These materials canusing be applied filtration, washing and vacuum drying [114]. These materials can be applied in photolithography [114]. separation methods as filtration, washing and vacuum drying [114]. These materials can be applied in photolithography [114]. in photolithography [114]. Maleopimaric Maleopimaric acid acid O O O O O O O O HO HO COOH COOH in ethyl acetate NH2 25-45°C,3h in ethyl acetate NH2 25-45°C,3hO O N2 N2 O O N OH N OH O O COOH COOH N-hydroxymaleopimarimide N-hydroxymaleopimarimide (NHMPI) yield: 70% (NHMPI) yield: 70% SO2Cl SO2Cl (C2H5)3N (C2acetone H5)3N in 4h in25°C, acetone 25°C, 4h O O N2 N2 R= R= SO2 O SO 2 N O O N O COOH COOH O O or: or: O or: or: O O O O O O O Unsaturated compound Unsaturated compound in ethyl acetate 3-4h in50-60°C, ethyl acetate 50-60°C, 3-4h NHMPI 2-diazoNHMPI 2-diazo1-naphthoquinone1-naphthoquinone4-sulfonate yield: 94% 4-sulfonate yield: 94% N2 N2 SO2 O SO 2 N O O N O COOR COOR Rosin-based molecular Rosin-based molecular glass compound glass compound yield: 90% yield: 90% Scheme 52. 52. Synthesis molecular glass glass compound. compound. Scheme Synthesis of of rosin-based rosin-based molecular Scheme 52. Synthesis of rosin-based molecular glass compound. 3.3. Macromolecular Compounds 3.3. Macromolecular Compounds repeated units typical of This section section describes describesrosin-derived rosin-derivedmacromolecular macromolecularcompounds compoundswith with repeated units typical This section describes rosin-derived macromolecular compounds with typical of macromolecules. It contains polymers, oligomers, and polymer functionalized of macromolecules. It contains polymers, oligomers,macroinitiators macroinitiators and repeated polymer units functionalized macromolecules. It contains oligomers, macroinitiators and polymer functionalized some polymers, small/medium molecule compounds, are not presented materials. Additionally, Additionally, molecule compounds, which which in the materials. Additionally, some small/medium molecule compounds, which are not presented the previous section, section,but butnecessary necessary to obtain appropriate macromolecules, are described here. inNonprevious to obtain appropriate macromolecules, are described here. Non-toxicity, previous section, but necessary to obtain appropriate macromolecules, are described here. Nontoxicity,origin, natural origin, rigidhydrophobicity, structure, hydrophobicity, excellent thermal properties, natural low price, low rigidprice, structure, excellent thermal properties, anticorrosive toxicity, natural origin, low price, rigid structure, hydrophobicity, excellent thermal properties, anticorrosive performance, biocidaland properties andare stickiness areattractive the mostreasons attractive to performance, mild biocidalmild properties stickiness the most to reasons use rosin anticorrosive biocidalof properties and stickiness are the most attractive reasons to use rosin derivatives in themild preparation polymerA materials. A disadvantage of these in derivatives inperformance, the preparation of polymer materials. disadvantage of these processes in processes comparison use rosin derivatives in the preparation of polymer materials. A disadvantage of these processes in comparison with petrochemical counterparts is the relatively lower reactivity of rosin derivatives comparison with counterparts is the relatively lower of rosin derivatives resulting from thepetrochemical steric hinderance of the diterpene skeleton and thereactivity usually lower purity of rosinresulting from the steric hinderance of the diterpene skeleton and the usually lower purity of rosinbased intermediates, as discussed in subsection 3.2.1. As a result, rosin-based polymer materials are based intermediates, as discussed in subsection 3.2.1. As a result, rosin-based polymer materials are usually characterized by distinct polydispersity and molecular weights rather far from their usually characterized by distinct polydispersity and molecular weights rather far from their Molecules 2019, 24, 1651 25 of 52 Molecules 2019, 24, x FOR PEER REVIEW 25 of 51 with petrochemical counterparts is the relatively lower reactivity of rosin derivatives resulting from the theoretical values. Therefore, their TRL and is lower than for small/medium molecule intermediates, compounds of steric hinderance of the diterpene skeleton the usually lower purity of rosin-based rosin. It is noteworthy, that compared to non-renewable counterparts, the use of rosin significantly as discussed in Section 3.2.1. As a result, rosin-based polymer materials are usually characterized increases the sustainability of preparation processes according to Green Chemistry rules, so25there is by distinct and molecular weights rather far from their theoretical values. Therefore, Molecules 2019,polydispersity 24, x FOR PEER REVIEW of 51 stillTRL highisdemand forfor basic and appliedmolecule researchcompounds in this field.of rosin. It is noteworthy, that compared their lower than small/medium theoretical values.counterparts, Therefore, their TRL lower than for increases small/medium molecule compounds of to non-renewable the use of is rosin significantly the sustainability of preparation 3.3.1.ItPolymers for Biomedical Applications rosin. is according noteworthy, compared to non-renewable counterparts, the usefor of rosin processes to that Green Chemistry rules, so there is still high demand basic significantly and applied increases the sustainability preparation Green Chemistry rules,polyethylene so there is research in this field.glycol) of Poly(ethylene rosin esters areprocesses oligomers,according which cantobe prepared from rosin, still highand demand basic and according applied research in this glycol maleicfor anhydride, to Scheme 53 field. prior to drying at 40–70 °C [81,238]. Proposed 3.3.1. Polymers for Biomedical Applications applications include shells for controlled drug delivery [238,239] and dental films for periodontitis 3.3.1. Polymers forMoreover, Biomedical Applications treatment [240]. maleopimaric acid PEG which esters can carbon from steel rosin, corrosion protection Poly(ethylene glycol) rosin esters are oligomers, can show be prepared polyethylene ◦ properties [241]. glycol and maleic anhydride, according Scheme 53which priorcan to drying at 40–70 [81,238]. Proposed Poly(ethylene glycol) rosin esters aretooligomers, be prepared fromCrosin, polyethylene Block copolymer of dehydroabietyl methacrylate ethylene glycol group applications include shells foraccording controlled drug delivery [238,239] andatdental films fordisulfide periodontitis glycol and maleic anhydride, toethyl Scheme 53 prior toand drying 40–70 °Cwith [81,238]. Proposed can be prepared via ATRP according to Scheme 54, prior to neutralization, evaporation and treatment [240]. Moreover, maleopimaric acid PEG esters can show carbon steel corrosion protection applications include shells for controlled drug delivery [238,239] and dental films for periodontitis precipitation Potential applications drug-delivery nanocarriers for cancer therapy properties [241].[168]. treatment [240]. Moreover, maleopimaric acidinclude PEG esters can show carbon steel corrosion protection [168]. properties [241]. O O O O Block copolymer of dehydroabietyl ethyl methacrylate and ethylene glycol with disulfide group O can be prepared via ATRP according to Scheme 54, prior to neutralization, evaporation and O O O precipitation [168]. Potential applications include drug-delivery nanocarriers for cancer therapy 160°C, 2h [168]. O O O COO [ (CH2)2O]9 H O[(CH2)2O]nH O Levopimaric acid PEG 400 ester O COOH O[(CH2)2O]nH O Maleopimaric acid yield: 42% 2+ pTSA 200°C, ?h O[(CH2)2O]nH O O COO[(CH2)2O]9 H O Maleopimaric acid O PEG 400 ester 160°C, 2h HO(CH2CH2)9H Zn (PEG 400) 220°C, 5h O COO [ (CH2)2O]9 H CH3O[CH2CH2O]nH O[(CH2)2O] nH 750) (PEG O O O O COO[(CH2)2O]9 H O Levopimaric acid PEG 400 ester O COOH 180-220°C Maleopimaric acid 4h yield: 42% COO [ (CH2)2O]n+1H CH3O[CH2CH2O]nH Maleopimaric (PEG 750)acid 2+ O HO(CH2CH2)9H Zn (PEG 400) 220°C, 5h COOH O pTSA 200°C, ?h PEG 750 ester CH3O[CH2CH2O]nH (PEG 750) Maleopimaric acid PEG 400 ester pTSA 200°C, ?h COO [ (CH2)2O]n+1H Levopimaric acid PEG 750 ester Levopimaric acid CH O[CH CH O] H O 3 2 2 n 180-220°C (PEG 750) Scheme53. 53.Synthesis Synthesis poly(ethyleneglycol) glycol) rosinesters. esters. 4h Scheme ofofpoly(ethylene rosin pTSA 200°C, ?h COO [ (CH2)2O]n+1H COO [ (CH2)2O]n+1H Maleopimaric acid of dehydroabietyl ethyl methacrylate Levopimaric acid Block copolymer and ethylene glycol with disulfide COOH PEG ester PEG 750 esterand Levopimaric acid O group can750 be prepared via ATRP according to Scheme 54, prior to neutralization, evaporation Poly(ethylene glycol) with O precipitation [168]. Potential applications drug-delivery nanocarriers for cancer therapy [168]. (bromoisobutyryl)ethyl disulfide group include Scheme 53. Synthesis Oof poly(ethylene glycol) rosin esters. O ( O O )113 O S S O Poly(ethylene glycol) with (bromoisobutyryl)ethyl disulfide group ( O )113 O O O O O CuBr/PMDETA in anisole; 47°C, <2h O O O O Br S O( O Br O )113 O O O O O S OO S O (O )n Br O O S O Poly(dehydroabietic ethyl methacrylate-b-ethylene glycol) with disulfide group O O O (PEG113-ss-PMrosin CuBr/PMDETA in anisole; 47°C, 27) <2h O O O S O Scheme 54. Preparation of block copolymer of dehydroabietyl )113 ethyl ( glycol )n Br O( O methacrylate O S and ethylene O with disulfide group. Poly(dehydroabietic ethyl methacrylate-b-ethylene glycol) with disulfide group (PEG113-ss-PMrosin27)methacrylate) can be prepared The rosin derivative quaternized poly-(N,N-dimethylaminoethyl via Scheme “living” reversibleof chain-transfer polymerization (RAFT) 54. Preparation Preparation ofaddition-fragmentation block copolymer copolymer of of dehydroabietyl dehydroabietyl ethyl methacrylate methacrylate and ethylene ethylene glycol from 54. block ethyl and glycol dehydroabietic acid, 3-chloropropanol, N,N-dimethylaminoethyl methacrylate and cumyl with disulfide group. dithiobenzoate as a RAFT transfer agent, according to Scheme 55, and using gel chromatography, precipitation and vacuum drying as separation techniques [242]. methacrylate) It can be usedcan asbe amphipathic The rosin derivative quaternized poly-(N,N-dimethylaminoethyl prepared antibacterial in a wide variety of biomedical and general use polymerization applications [242].(RAFT) from via “living” agent reversible addition-fragmentation chain-transfer dehydroabietic acid, 3-chloropropanol, N,N-dimethylaminoethyl methacrylate and cumyl dithiobenzoate as a RAFT transfer agent, according to Scheme 55, and using gel chromatography, precipitation and vacuum drying as separation techniques [242]. It can be used as amphipathic Molecules 2019, 24, 1651 26 of 52 The rosin derivative quaternized poly-(N,N-dimethylaminoethyl methacrylate) can be prepared via “living” reversible addition-fragmentation chain-transfer polymerization (RAFT) from dehydroabietic acid, 3-chloropropanol, N,N-dimethylaminoethyl methacrylate and cumyl dithiobenzoate as a RAFT transfer agent, according to Scheme 55, and using gel chromatography, precipitation and vacuum drying as separation techniques [242]. It can be used as amphipathic antibacterial agent in a wide variety of biomedical and general use applications [242]. Molecules 2019, 24, x FOR PEER REVIEW 26 of 51 Molecules 2019, 24, x FOR PEER REVIEW Cl Cl COOH COOH Dehydroabieticacid acid Dehydroabietic N N 26 of 51 OH OH oxalylchloride chloride oxalyl triethylamine triethylamine in THF; 0°C, 15h in THF; 0°C, 15h COO COO Cl Cl Cl Cl 3-chloropropyl 3-chloropropyl dehydroabietate yield: 65% dehydroabietate yield: 65% S S O O O O N,N-dimethylaminoethyl N,N-dimethylaminoethyl methacrylate (DMAEMA) methacrylate (DMAEMA) N N COO COO Rosin derivative Rosin derivative quaternized quaternized poly-DMAEMA poly-DMAEMA Mn=8300, 14400, 17600, Mn=8300, 14400, 17600, 19300, 19600, 59800 19300, 19600, 59800 S S )n SS O O O O N N )n SS O O O O AIBN AIBN 5h 60°C, 60°C, 5h n-m O O O O in in acetonitrile acetonitrile 80°C, 72h 80°C, 72h S S ( ( S )n-m ) S ))m (( m (( Poly-DMAEMA Poly-DMAEMA Mn=5490, 7500, 1400 or 41000 Mn=5490, 7500, 1400 or 41000 N N Scheme 55. Preparation of the rosin derivative quaternized poly(dimethylaminoethyl methacrylate). Scheme 55. Preparation of the rosin derivative quaternized quaternized poly(dimethylaminoethyl poly(dimethylaminoethyl methacrylate). methacrylate). 3.3.2. Elastomers 3.3.2. 3.3.2. Elastomers Elastomers Poly(dehydroabietic ethyl methacrylate-β-n-butyl acrylate-β-dehydroabietic ethyl methPoly(dehydroabietic methacrylate-β-n-butyl acrylate-β-dehydroabietic ethyl meth-acrylate) Poly(dehydroabieticethyl ethyl methacrylate-β-n-butyl acrylate-β-dehydroabietic ethyl methacrylate) triblock copolymer can be prepared in ATRP polymerization from butyl acrylate, triblock copolymer can be prepared in prepared ATRP polymerization from butyl acrylate, dehydroabietic acrylate) triblock copolymer can be in ATRP polymerization from butyl acrylate, dehydroabietic hydroxyethyl acrylate and diethyl meso-2,5-dibromoadipate according to Scheme 56, hydroxyethyl acrylate and diethyl meso-2,5-dibromoadipate according to Scheme 56, prior to diluting, dehydroabietic hydroxyethyl acrylate and diethyl meso-2,5-dibromoadipate according to Scheme 56, prior to diluting, neutralization, evaporation, precipitation and vacuum drying [146]. Its application neutralization, evaporation, precipitation and vacuum drying [146]. Its application is sustainable prior to diluting, neutralization, evaporation, is sustainable thermoplastic elastomers [146]. precipitation and vacuum drying [146]. Its application thermoplastic elastomers [146]. is sustainable thermoplastic elastomers [146]. C4H9 C4H9 O O O O Butyl Butyl acrylate acrylate O Br Br O OO Br OO O NiBrBr2(PPh3)2O C4H9 C4O H9 O O O Br ( Br ( O O O O )n )n Poly(n-butyl acrylate) Poly(n-butyl acrylate) macroinitiatior macroinitiatior yield: 58% yield: 58% NiBr 85°C, P, 17h 2(PPh 3)2 85°C, P, 17h ( ( O O O O Br O )nBr )n O O O O O O O CO 4H9 O Cl ( C4H9 C4H9 O O Cl ( CO 4H9 O O O )m( )m( O Poly(dehydroabietic Poly(dehydroabietic ethyl methacrylate-bethyl methacrylate-b-n-butyl acrylate-b-n-butyl acrylate-b-dehydroabietic ethyl -dehydroabietic methacrylate) yield: ethyl 36% methacrylate) yield: 36% O O )n )n O ( ( O O O O O O OO O O O CuCl/PMDETA in DMF; 90°C, 8h O CuCl/PMDETA in DMF; 90°C, 8h O O Cl )m Cl )m O O O O O9 C4H O O )n ( )nO ( C4H9O O Mn=76kg/mol Mn=76kg/mol Scheme 56. Synthesis of rosin-based triblock copolymer. Scheme 56. Synthesis of rosin-based triblock copolymer. copolymer. Cellulose/rosin ATRP macroinitiators can be prepared from dehydroabietic acid, cellulose and Cellulose/rosin ATRP can from dehydroabietic acid, 2-bromoisobutyryl according to Scheme 57, prior to drying at 40 °C [142]. It iscellulose used for and the Cellulose/rosin bromide, ATRP macroinitiators macroinitiators can be be prepared prepared from dehydroabietic acid, cellulose and ◦ C [142]. It is used for the 2-bromoisobutyryl bromide, according to Scheme 57, prior to drying at 40 preparation of graftbromide, copolymers [142]. to Scheme 57, prior to drying at 40 °C [142]. It is used for the 2-bromoisobutyryl according preparation of Rosin-acid-modified ethyl [142]. cellulose/butyl acrylate graft copolymer can be prepared in ATRP preparation of graft graft copolymers copolymers [142]. reaction from dehydroabietic acid, cellulose,acrylate 2-bromoisobutyryl bromide butyl in acrylate Rosin-acid-modified ethyl cellulose/butyl graft copolymer can beand prepared ATRP accordingfrom to Scheme 57, prior to sorption of CuBr x and precipitationbromide in methanol. reaction dehydroabietic acid, cellulose, 2-bromoisobutyryl and [142]. butylPotential acrylate applications include thermoplastic elastomers and coatings with UV absorption property [142]. according to Scheme 57, prior to sorption of CuBr x and precipitation in methanol. [142]. Potential applications include thermoplastic elastomers and coatings with UV absorption property [142]. Molecules 2019, 24, 1651 27 of 52 Molecules 2019, 24, x FOR PEER REVIEW OR Mn=7750-17100 g/mol R = H or Et RO HO Bu RO O Molecules 2019, 24, x FOR PEER REVIEW O Br O OH Br OR OR 2-bromoisobutyryl and Ethyl R = H or Et RO bromide cellulose (EC) RO DMAP inOTHF; 25°C, 24h HO O Br RO O O O RO O 2-bromoisobutyryl and Ethylchloride Cl Dehydroabietyl bromide cellulose (EC) O C EC-g-(DA)-Br OR RO O ATRP macroinitiator O O 27 of 51 O O OR O Bu O O O RO O O RO O Mn=7750-17100 g/mol O CuBr/PMDETA in THF/DMF Bu 70°C, 6h Br OR O O OR O OH Br C OR C OR O O C OR ( )n O 27 of 51 O RO O O O Br EC-g-(DA)-g-poly(butyl acrylate) O RO OR CuBr/PMDETA Oyield 76% in THF/DMF O RO Bu OR O ( )n 70°C, 6h O butyl acrylate. DMAP in57. THF; 25°C, 24hof graft copolymer of rosin-modified ethyl Scheme Synthesis and Scheme 57. Synthesis of graft copolymer of rosin-modified ethylcellulose cellulose and butyl acrylate. O )n( )m Cellulose grafted byethyl copolymer ofBrrosin acid ethyl methacrylate and alkyl Br Rosin-acid-modified cellulose/butyl acrylate graft copolymer can(meth)acrylate be preparedcan in be ATRP EC-g-(DA)-Br acrylate) prepared via ATRP, according to Scheme 58, prior to sorption andEC-g-(DA)-g-poly(butyl precipitation in methanol [166]. reaction from O dehydroabietic acid, cellulose, 2-bromoisobutyryl bromide and butyl acrylate according Cl ATRP macroinitiator Dehydroabietyl chloride“green” yield 76%hydrophobic, Potential applications include thermoplastic elastomers having significant to Scheme 57, prior to sorption of CuBrx and precipitation in methanol. [142]. Potential applications thermal and mechanical features [166]. Scheme 57. Synthesis of graft rosin-modified ethyl cellulose and[142]. butyl acrylate. include thermoplastic elastomers andcopolymer coatingsofwith UV absorption property Cellulose grafted by copolymer of rosin acid ethyl methacrylate and alkyl (meth)acrylate can OR ROrosin OH Cellulose grafted by copolymer of acid ethyl methacrylate and alkyl (meth)acrylate can be be prepared via ATRP, according to Scheme 58, prior to sorption and precipitation in methanol [166]. prepared via ATRP, according to Scheme 58, prior to sorption and methanol [166]. O O precipitation in O O Potential applications include “green” thermoplastic elastomersOhaving havingsignificant significant hydrophobic, Potential applications include “green” thermoplastic elastomers hydrophobic, OH O(CH2)2O RO thermal and mechanical features [166]. OR l thermal and mechanical features [166]. O O O O )m RO Cellulose R =inHtoluene; or CuBr/PMDETA 80-90°C, 24h macroinitiator O (Cell) and instead of BA butyl acrylate (BA) Cell-g-P(BA-co-DAEMA) lauryl methacrylate O yield: 80%O C4H9 O also works C12H25 O Mn = 27000, 28000, 31700, 49300, 40700, 54800, RO O 83300, 101100, 129900, 142800, 200100, 242600 CuBr/PMDETA in toluene; 80-90°C, 24h RO O OH O l O O RO O OH O(CH2)2O O O OH O O(CH2)2O O OH O C4H9 l O O O )n ( O(CH2)2O O O )m( Dehydroabietic ethyl methacrylate (DAEMA) O O ( O(CH2)2O Br O O )n( OR C12Hl25 O ( Br ( O Cellulose R = H or macroinitiator OR RO OH (Cell) and instead of BA butyl acrylate (BA) O O lauryl methacrylate O C4H9 O also works OH RO O O )m( O Cell-g-P(BA-co-DAEMA) Scheme 58. Synthesis of graft copolymer of cellulose, rosin acid and butyl acrylate (or lauryl O C4H9 Dehydroabietic yield: 80% methacrylate). )n ethyl methacrylate Mn = 27000, 28000, 31700, 49300, 40700, 54800, (DAEMA) 83300, solids, 101100, 129900, 242600in several O(CH 2)2O according to Scheme Rosin alcohols are colorless which142800, can be200100, prepared ways O O drying [243,244] 59, and using such separation methods like evaporation, extraction, washing and [245]. They be used in graft preparation of ofcross-linked structures with acrylamide and N,N′Scheme 58. can Synthesis copolymer cellulose, rosin acidand and butyl acrylate lauryl Scheme 58. Synthesisofofgraft copolymer of cellulose, rosin acid butyl acrylate (or (or lauryl methylenebisacrylamide [243,244], as well as norbornene-based monomers [245]. methacrylate). methacrylate). Rosin-norbornene monomers, i.e. dehydroabietanyl norborn-5-ene-2-carboxylate and 4((norborn-5-ene-2-carbonyl)oxy)butyl dehydroabietate, are oily in liquids [245].ways They can be Rosin alcoholsare are colorless which can becan prepared in several ways according to Scheme Rosin alcohols colorlesssolids, solids, which be viscous prepared several according synthesized from dehydroabietic acid derivatives and norbornenecarboxylic acid according toand 59, and using suchusing separation like methods evaporation, washing and drying [243,244] to Scheme 59, and such methods separation likeextraction, evaporation, extraction, washing Scheme 59, prior to washing, drying and column chromatography [245]. Its application [245]. They can beevaporation, usedcan in be preparation of cross-linked structures with acrylamide and N,N′-and drying [243,244] [245]. They used in preparation of cross-linked structures with acrylamide is polymerization, or block copolymerization with norbornene, via “living” [245]. ring-opening metathesis methylenebisacrylamide [243,244], as well as norbornene-based monomers 0 N,N -methylenebisacrylamide [243,244], as well as norbornene-based monomers [245]. polymerization (ROMP) process [245,246]. Rosin-norbornene monomers, i.e. dehydroabietanyl norborn-5-ene-2-carboxylate and 4Rosin-norbornene monomers, i.e., dehydroabietanyl norborn-5-ene-2-carboxylate and Homopolymers of rosin-modifieddehydroabietate, norbornene can be synthesized vialiquids ROMP[245]. process according ((norborn-5-ene-2-carbonyl)oxy)butyl are viscous oily They can be 4-((norborn-5-ene-2-carbonyl)oxy)butyl dehydroabietate, are viscous oily liquids [245]. can They can to Scheme 59 [246]. Moreover, triblock and pentablock copolymers with norbornene segments synthesized from dehydroabietic acid derivatives and norbornenecarboxylic acid according be to be synthesized from dehydroabietic acid derivatives and norbornenecarboxylic acid according to Scheme 59, prior to evaporation, washing, drying and column chromatography [245]. Its application Scheme 59, prior to evaporation, washing, drying column chromatography [245]. Its application is polymerization, or block copolymerization withand norbornene, via “living” ring-opening metathesis polymerization (ROMP) process [245,246]. Homopolymers of rosin-modified norbornene can be synthesized via ROMP process according to Scheme 59 [246]. Moreover, triblock and pentablock copolymers with norbornene segments can be Molecules 2019, 24, 1651 28 of 52 Molecules 2019, 24, x FOR PEER REVIEW 28 of 51 is polymerization, or block copolymerization with norbornene, via “living” ring-opening metathesis prepared [246]. They can be applied as bio-based thermoplastic elastomers showing well-designed polymerization (ROMP) process [245,246]. architecture and high elastic recovery [245,246]. Dehydroabietic acid Molecules 2019, 24, x FOR PEER REVIEW OH HO(CH2)4OH SOCl2 28 of 51 O prepared [246]. They can be applied as bio-based thermoplastic elastomers showing well-designed O OH O (CH2)4 in DMF (C2H5)3N architecture and high elastic recovery [245,246]. trimethylacetic 0°C, 3h in CH2Cl2 (CH ) O 0-40°C, 18h OH Dehydroabietic acid O 4'-hydroxybutyl OH dehydroabietate (CH yield: 73% 2)4 O HO(CH2)4OH SOCl2 (C2H5)3N in CH2Cl2 0-40°C, 18h in DMF LiAlH4 in THF 0°C, 3h 0°C, 13h OH O O O 4'-hydroxybutyl O OH LiAlH4 in THF 0°C, 13h Dehydroabietane-18-ol yield: 84% O OH OH O in THF 60°C, 24h OH anhydride DMAP in THF 60°C 24h O Grubbs' cat. in CH2Cl2 0.75h O O in CH2Cl2 0.75h Dehydroabietanyl O norborn-5-ene-2-carboxylate O Grubbs'85% cat. (Monomer 1) yield: (CH2)4 O O O O OH 4-((norborn-5-ene-2O trimethylacetic -carbonyl)oxy)butyl (CH2)4 dehydroabietate anhydride Grubbs' cat. O 82% DMAP (Monomer 2) yield: in CH2Cl2 dehydroabietate O trimethylacetic yield: 73% Grubbs' cat. O 2 4 anhydride DMAP in THF 60°C, 24h O 0.75h n Polymer O (CH22)4 O O O 4-((norborn-5-ene-2-carbonyl)oxy)butyl dehydroabietate O (Monomer 2) yield: 82% O m n O n O Polymer 2 1h m Copolymer 1 n n trimethylacetic O Polymer 1 Mn=114-187 kg/mol anhydride in CH2Cl2 O O DMAP 0.75h O in THF DehydroabietaneScheme Synthesisofofrosin-norbornene rosin-norbornene monomers monomers and Scheme 59.59. Synthesis and polymerization polymerizationofofthem. them. Dehydroabietanyl 60°C -18-ol yield: 84% 24h norborn-5-ene1h Rosin-based waterborne polyurethanes can can be prepared from maleopimaric acid, according diethylene Homopolymers of rosin-modified norbornene be synthesized via ROMPCopolymer process to -2-carboxylate 1 n glycol,59polyether glycol, toluene diisocyanate, propionic acid andMtrimethylamine Polymer 1with norbornene (Monomer 1) pentablock yield: 85%dimethylol Scheme [246]. Moreover, triblock and copolymers segments can be =114-187 kg/mol n according to They Scheme and using such separation methods as vacuum dryingwell-designed and rotary prepared [246]. can60, be applied as bio-based thermoplastic elastomers showing evaporation [111]. Such polymers can be also synthesized using fumaropimaric rosin instead of Scheme 59. Synthesis of rosin-norbornene monomers and polymerization of them. architecture and high elastic recovery [245,246]. maleopimaric acid [109]. These materials exhibit excellent mechanical properties, thermal stability, Rosin-based waterborne polyurethanes can be prepared from maleopimaric acid, diethylene waterRosin-based resistance, antimicrobial properties against Gram-negative Escherichia coli andacid, Gram-positive waterborne polyurethanes can be prepared from maleopimaric diethylene glycol, polyether glycol, toluene diisocyanate, dimethylol propionic acid and trimethylamine according Staphylococcus aureus [109,111] and an affinity for cellulose nanocrystals allows to apply glycol, polyether glycol, toluene diisocyanate, dimethylol propionic[112], acidwhich and trimethylamine to Scheme 60, and using such separation methods as vacuum drying and rotary evaporation [111]. them in various biomass-based and composite according to Scheme 60, and polymer using such separationmaterials. methods as vacuum drying and rotary Such polymers can be also synthesized using fumaropimaric rosin instead of maleopimaric acid [109]. evaporation [111]. Such polymers can be also synthesized using fumaropimaric rosin instead of These materials exhibit excellent mechanical thermal stability, resistance, antimicrobial O OHproperties, HO DEG TDI PEG TDI water DEG MPA DEG TDI H maleopimaric stability, HO [109]. These OH materials exhibit excellent mechanical properties, thermal TEA O acid O properties against Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus [109,111] DEG DMPA water resistance, antimicrobial properties against Gram-negative Escherichia coli and Gram-positive O (DEG) nanocrystals [112], which allows to apply them in various biomass-based COO andStaphylococcus an affinity for cellulose HO and DEG an MPA aureus [109,111] affinity forHO cellulose nanocrystals [112],MPA which DEG TDI PEG TDI DEG DEGallows TDI to apply 120-240°C polymer and composite 8hmaterials. them in various biomass-based and composite materials. Rosin-based waterborne polyurethane HO polymer OH (PEG) O HO O COOH OCN O O (DEG) Maleopimaric acid120-240°C 8h (MPA) TDI OCN PEG COOH TDI DEG OH HO DEG 110-80°C 3hOH NCO DEG MPA HO DEG HO NCONCO OCN PEG TDI N DEG MPA DEG 30°C TDI (TEA) OCN DEG TDI NCO DEG TDI DEG N 60°C 3h PEG PEG TDI TDI 30°CTDI MPA DEG (TEA) DEG DEG (DMPA) 60°C 3h 0.5h HO HO DEG TDI PEG TDI DMPA DEG DEG MPA DEG TDI DEG Scheme polyurethane. Scheme60. 60.Preparation Preparationof ofrosin-based rosin-based waterborne waterborne polyurethane. 3.3.3. Coatings and Adhesives TEA H DMPA COO DEG HO TDI PEG DEG TDI PEG TDI DEG MPA DEG TDI OH TDI waterborne DEG MPA DEG TDI Rosin-based polyurethane COOH DMPA COOH Maleopimaric acid Scheme 60. Preparation ofHO rosin-basedOHwaterborneTDI polyurethane. DEG MPA (MPA) (TDI) COOH TDI PEG TDI DEG MPA 3.3.3. Coatings and Adhesives 0.5h HO HO OH (TDI) (PEG) MPA DEG TDI 110-80°C(DMPA) 3h TDI HO TDI COOH Molecules 2019, 24, x FOR PEER REVIEW Molecules 2019, 24, 1651 29 of 51 29 of 52 Rosin-modified poly(acrylic acid) is a solid. It can be prepared from poly(acrylic acid) and abietic acid according to Scheme 61, prior to washing and vacuum drying [247]. It can be applied as an 3.3.3. Coatings and Adhesives Molecules 2019, 24, 24, FOR PEER REVIEW REVIEW 29 of of 51 51 Molecules 2019, xx FOR PEER 29 excellent binder for silicon-graphite negative electrodes in lithium-ion batteries [247]. Rosin-modified poly(acrylic acid) is a solid. It can be prepared from poly(acrylic acid) and abietic Rosin-modified poly(acrylic acid) acid) is is aa solid. solid. It It can can be be prepared prepared from from poly(acrylic poly(acrylic acid) acid) and and abietic abietic Rosin-modified n=? poly(acrylic HO vacuum acid according to M Scheme 61, prior to washing and drying [247]. It O can be applied as an acid according according to Scheme Scheme 61, 61, prior prior to to washing washing and vacuum vacuum drying drying [247]. It It can can be be applied as an O OH to H acid and excellent binder for silicon-graphite negative in lithium-ion[247]. batteries [247].applied as an O OH electrodes H 3O excellent binder for silicon-graphite negative electrodes in lithium-ion batteries [247]. O O excellent binder for silicon-graphite negative electrodes in lithium-ion batteries [247]. O ( )n (acid-catalyzed ( ) activation) n (nucleophilic addition Mn=? =? Poly(acrylic acid) HO M n HO 25°C, 3h ( )OnO & elimination) Activated PAA PAA-Rosin O OH (PAA) H O OH H 100°C, 12h O OH H3O O O O OH O H 3 O O O O Scheme 61. Preparation of rosin-modified poly(acrylic acid). (( ))nn (acid-catalyzed (acid-catalyzed activation) (nucleophilic addition addition (( ))nn Poly(acrylic acid) acid) activation) (nucleophilic Poly(acrylic 25°C, 3h 3h & elimination) elimination) Activated PAA PAA-Rosin 25°C, (( ))dehydroabietylamine & (PAA) Activated PAA nn PAA-Rosin N-dehydroabietic acrylamide is a white solid. It can be 12h synthesized from (PAA) 100°C, 100°C, 12h and acryloyl chloride according to Scheme 62, prior to washing and vacuum distillation. It can be Scheme61. 61.Preparation Preparationof of rosin-modified rosin-modified poly(acrylic poly(acrylic acid). Scheme poly(acrylic acid). of rigid petroleumScheme 61. Preparation of rosin-modified used as a bio-based acrylic monomer in compolymerization processes acid). instead based monomers [161]. N-dehydroabieticacrylamide acrylamideisis isaaawhite whitesolid. solid. It It can can be be synthesized from dehydroabietylamine N-dehydroabietic It synthesizedfrom fromdehydroabietylamine dehydroabietylamine N-dehydroabietic acrylamide white solid. Rosin and soybean oil-based acrylic copolymers cansynthesized be prepared from N-dehydroabietic and acryloyl chloride according to Scheme 62, prior to washing and vacuum distillation. It can can be and acryloyl chloride according to Scheme 62, prior to washing and vacuum distillation. can beare used and acryloyl chloride according to Scheme 62, prior to washing and vacuum distillation. It be acrylamide and acrylated epoxidized soybean oil according to Scheme 62 [161].It They as aa bio-based bio-based acrylic monomer monomer in compolymerization compolymerization processes instead of rigid rigid petroleumas characterized aused bio-based acrylic monomer inhydrophobicity compolymerization processes instead ofalso rigid petroleum-based used as acrylic in processes instead of petroleumby considerable and heat resistivity and other properties based monomers [161]. based monomers [161]. petroleum-based materials [161]. monomers [161]. comparable with similar Rosin and and soybean soybean oil-based oil-based acrylic acrylic copolymers copolymers can can be be prepared prepared from from N-dehydroabietic N-dehydroabietic Rosin acrylamide and acrylated epoxidized soybean oil according to Scheme 62 [161]. They They are are O acrylamide and O acrylated epoxidized soybean oil according to Scheme 62 [161]. O HN hydrophobicity and heat resistivity and also other properties characterized by considerable characterized by considerable hydrophobicity and heat resistivity and also other properties Cl Triglyceride comparable with with similar similar petroleum-based petroleum-based materials materials [161]. O 1-3 comparable [161]. in CH2Cl2 Acrylated epoxidized DHAAM -5-23°C, 0.5h soybean oil (AESO) O O O O O NH2 ( AESO )m( DHAAM )n HN tert-butyl benzoilO peroxide HN Cl <170°C, 9h Cl Rosin and soybean oil-based N-dehydroabietic Triglyceride O Triglyceride O 1-3 1-3 in CH CH2Cl Cl2 acrylamide (DHAAM) acrylic copolymer Dehydroabietylamine in Acrylated epoxidized 2 2 Acrylated epoxidized DHAAM DHAAM -5-23°C, 0.5h 0.5h -5-23°C, soybean oil (AESO) oil (AESO) Scheme62. 62.Preparation Preparationof of rosin rosin and andsoybean plant oil-based acrylic AESO )m( DHAAM NH2 Scheme plant oil-based acryliccopolymers. copolymers. NH tert-butyl benzoil peroxide peroxide (( AESO )m( DHAAM ))nn 2 tert-butyl benzoil <170°C, 9h Rosin and soybean oil-based N-dehydroabietic <170°C, 9h Rosin and soybean oil-based N-dehydroabietic Rosin and POSS-based non-isocyanate polyurethanes can be prepared from rosin-based cyclic acrylic copolymer Dehydroabietylamine Rosin and soybean oil-based acrylic copolymers can be prepared from N-dehydroabietic acrylamide acrylamide (DHAAM) acrylic copolymer Dehydroabietylamine acrylamide (DHAAM) carbonate, polyamine and cyclic carbonate-functionalized POSS according to Scheme 63 [200]. Theirby and acrylated epoxidized soybean oil according to Scheme 62 [161]. They are characterized Scheme 62. 62. Preparation Preparation of of rosin rosin and and plant plant oil-based oil-based acrylic acrylic copolymers. copolymers. Scheme applications include coatings showing improved water tolerance, hardness and thermal stability considerable hydrophobicity and heat resistivity and also other properties comparable with similar [200]. petroleum-based [161]. Rosin and and materials POSS-based non-isocyanate polyurethanes polyurethanes can can be be prepared prepared from from rosin-based rosin-based cyclic cyclic Rosin POSS-based non-isocyanate Rosin and POSS-based non-isocyanate polyurethanes can be prepared from rosin-based cyclic carbonate, polyamine and cyclic carbonate-functionalized POSS according to Scheme 63 [200]. Their O carbonate-functionalized carbonate, polyamine and cyclic 1. H2N R' NH2 POSS according to (H) SchemeO63 [200]. Their O R' NH O R N carbonate, polyamine and cyclic carbonate-functionalized POSS according to Scheme 63 [200]. Their O O applications include coatings showing improved water tolerance, hardness and thermal stability O Rosin-based applications include coatings showing improved water tolerance, hardness and thermal stability O R' NH R N O O applications include coatings showing improved water tolerance, hardness and thermal stability [200]. cyclic carbonate [200]. O (H) [200]. O Rosin-based Rosin-based cyclic carbonate carbonate cyclic O O C=O O O O O O OH C=O C=O O O R' = R= R= OH OH Scheme O O O O O R= O O OO O O OH or: O O O O O O O or: O O O O O O or: or: O (CH2)2 or: OH OH O O O O O O O O O O O O O O O O O 2. H2N N R' R' NH NH2 1. H 1. 2 in2 DMF O O 100°C, 12h O O 2. 2. O O in DMF DMF in 100°C, 12h 12h 100°C, or: ( N )2 H O O O O O O O (H) O (H) R' NH NH O R N N R' = cyclic carbonate O R functionalized POSS R' NH R N O R N O (H) R' NH (H) O O O OO O O COO R N R' NH O (H) cyclic carbonate carbonate == cyclic functionalized POSS functionalized POSS Rosin & POSS-based O O non-isocyanate polyurethane COO COO R' NH NH N R' R N R (H) (H) O O 63. Preparation of rosin & POSS-based non-isocyanate polyurethane. Rosin & & POSS-based POSS-based N ))2 (CH2))2 or: or: or: (( Rosin N (CH or: or: 2 2 or: H 2 H non-isocyanate polyurethane Rosin can be introduced as a chain extender into polyurethanes to obtain rosin-based urethanenon-isocyanate polyurethane amide hard segments, according to Scheme 64 [248]. A potential application of the prepared materials Scheme 63. 63. Preparation Preparation of of rosin rosin & & POSS-based POSS-based non-isocyanate non-isocyanate polyurethane. Scheme is as sealants Scheme for non-invasive disc regeneration surgery [248]. Physicalpolyurethane. mixtures of rosin and 1,463. Preparation of rosin & POSS-based non-isocyanate polyurethane. butanediol were also investigated for this use [249]. Rosincan canbe be introduced introduced asas chain extender into polyurethanes polyurethanes to obtain obtain rosin-based rosin-based urethaneRosin can be aa chain extender into to urethaneRosin introducedas a chain extender into polyurethanes to obtain rosin-based amide hard segments, according to Scheme 64 [248]. A potential application of the prepared materials amide hard segments, according to Scheme [248]. A64potential of the prepared materials urethane-amide hard segments, according to64 Scheme [248]. Aapplication potential application of the prepared is as as sealants sealants for for non-invasive non-invasive disc disc regeneration regeneration surgery surgery [248]. [248]. Physical Physical mixtures mixtures of of rosin rosin and and 1,41,4is butanediol were were also also investigated investigated for for this this use use [249]. [249]. butanediol R' == R' Molecules 2019, 24, 1651 30 of 52 materials is as sealants for non-invasive disc regeneration surgery [248]. Physical mixtures of rosin and 1,4-butanediol were also investigated for this use [249]. Molecules 2019, 24, x FOR PEER REVIEW 30 of 51 Molecules 2019, 24, x FOR PEER REVIEW 30 of 51 O Molecules 2019,Ur 24, xUr FORNCO PEER REVIEW OCN O OCN 80°C,Ur0.1hUr NCO HN HN O Ur 80°C, 0.1h OCN Ur Ur NCO OCN Ur Ur NCO Ur HN Ur OCN OCN Ur Ur NCO 80°C, 0.1h COOH Rosin Ur Ur O O H N HN OCN Ur Ur N Ur Ur NCO NO O OCN Ur Ur H Ur Ur NCO N ON Urethane-amide hard segment NCO Ur UrNCO COOH COOH Rosin Rosin 30 of 51 Ur NCO NCO OCN Ur Ur Ur Ur NCO Urethane-amide hard segment O Scheme 64. Preparation urethane-amide hard segments. segments.hard segment Urethane-amide Scheme 64. Preparation of of rosin-modified rosin-modified urethane-amide hard Scheme 64. Preparation of rosin-modified urethane-amide hard segments. Scheme 64. Preparation of rosin-modified urethane-amide hard segments. Maleopimaric acid-modified polyester polyol aqueous dispersion can be prepared from Maleopimaric acid-modified polyester polyol aqueous dispersion can be prepared from maleopimaric acid, adipic acid, isophtalic 5-sulfoisophtalic acid, neopentyl glycol and Maleopimaric polyester acid, polyol aqueous dispersion be prepared from maleopimaric acid, acid-modified adipic acid, isophtalic acid, 5-sulfoisophtalic acid,canneopentyl glycol and trimethylolpropane, according totoScheme 65, prior dissolving/dispersing in water and diethylene maleopimaric acid, adipic acid, isophtalic acid,to acid, neopentyl glycol and trimethylolpropane, according Scheme 65, prior to5-sulfoisophtalic dissolving/dispersing in water and diethylene glycol monoethyl ether acetate as a cosolvent [91]. It can be applied in two-component waterborne cosolvent [91]. be applied in two-component waterborne trimethylolpropane, according 65, prior in water and diethylene glycol monoethyl ether acetate to as Scheme a cosolvent [91].to It dissolving/dispersing can be applied in two-component waterborne polyurethane materials and coatings showing improved stability, hardnesshardness and resistances polyurethane materials and coatings [110] showing improved thermal stability, hardness and glycol monoethyl ether acetate as [110] a cosolvent [91]. It canimproved be thermal appliedthermal in two-component waterborne polyurethane materials and coatings [110] showing stability, and polyurethane materials and coatings [110] showing improved thermal stability, hardness and to ethanol and water [91,110]. resistances to to ethanol and [91,110]. resistances ethanol andwater water [91,110]. resistances to ethanol and water [91,110]. HOOC HOOC HOOC COOH COOH HOHO COOH OH OH HO OH HO HO (( HO butyl stannoicacid acid butyl stannoic butyl stannoic acid 150-205°C SOSO 150-205°C 3Na3Na SO3Na 5-sulfoisophtalic acid 150-205°C ( O O O O O O O O OO ))nn O )n O Hydrophilic polyester polyester OH Hydrophilic OH polyester OH Hydrophilic intermediate (HPI) intermediate (HPI) intermediate (HPI) SO SO33Na Na SO3Na 5-sulfoisophtalic acid 5-sulfoisophtalic acid O O O OH OH OH HO OH HO OH OH OH HO HOHO OH Neopentyl HO OHNeopentyl Neopentyl glycol HOOC COOH Trimethylolglycol glycol HOOC COOH TrimethylolHOOC COOH (NPG) Trimethylolpropane (TMP) (NPG) (NPG) propane (TMP) propane (TMP) COOH COOH COOH COOH HOOC COOH COOH HOOC HOOC Isophtalic acid Adipic acid Maleopimaric Isophtalic Adipic acid Maleopimaric Isophtalic acidacid Adipic acid Maleopimaric (IPA) (AA) acid (AA) acid (IPA)(IPA) (AA) acid (MPA) (MPA) (MPA) butyl stannoic acid butylstannoic stannoic acid O butyl acid OO in in xylene xylene in150-230°C, xylene 3.5h 150-230°C, 3.5h O 150-230°C, 3.5h OO Mn = 2422 n = 2422 Mn =M2422 Maleopimaric Maleopimaric Maleopimaric acid-modified acid-modified NPG MPA HPI IPA acid-modified polyester polyol MPAHPIHPI IPAIPApolyester NPG NPG MPA polyol polyester polyol NPG ( IPA HPI MPA TMP AA HPI ) IPA NPG NPG AA AA HPI HPI IPA IPA NPG NPG MPATMP )m m NPG( ( IPA IPA HPI HPI MPA TMP )m Scheme Preparation hydrophilic maleopimaricacid-modified acid-modified poliester polyol. Scheme 65.65. Preparation ofof hydrophilic acid-modified poliester polyol. Scheme Preparationof ofhydrophilic hydrophilic maleopimaric maleopimaric poliester polyol. Scheme 65.65. Preparation maleopimaric acid-modified poliester polyol. 3.3.4. Surfactants 3.3.4. 3.3.4.Surfactants Surfactants 3.3.4. Surfactants Rosin-based comb-like polymeric surfactants can bebe prepared from rosin glycidyl methacrylate and Rosin-based surfactants can prepared from rosin glycidyl methacrylate Rosin-basedcomb-like comb-like polymeric polymeric surfactants can be prepared from rosin glycidyl methacrylate Rosin-based comb-like polymeric surfactants can be prepared from rosin glycidyl methacrylate methacrylate polyethylene glycol ester according to Scheme 66, prior to vacuum drying, precipitation, and ester according according to to Scheme Scheme 66, 66,prior priortotovacuum vacuumdrying, drying, and methacrylate methacrylate polyethylene polyethylene glycol glycol ester andprecipitation, methacrylate polyethylene glycol ester according to Scheme 66, prior to vacuum drying, dialysis and freezing [175]. Their application include preparation of pymetrozine water suspension dialysis and freezing [175]. Their application include preparation of pymetrozine water precipitation, dialysis and freezing Their application include preparation of pymetrozine water precipitation, dialysis and freezing [175]. Their application include preparation of pymetrozine water concentrates [175]. suspension concentrates [175]. suspension concentrates [175]. suspension concentrates [175]. O O O O OO O CH22O) O)nnCH CH33 O(CH22CH O(CH OHMethacrylate polyethylene OH AIBN (MAPEG) glycol ester in ethanol ethanol OH AIBN 13h <80°C, 13h in ethanol <80°C, 13h (( ( OO O )x)x( ( )y)y ) ( OO x O ( ))n )n n methacrylate (RGMA) O Methacrylate polyethylene Methacrylate polyethylene O(CH CH2O)nCH3 glycol ester 2(MAPEG) (MAPEG) O)O y O (( Rosinglycidyl glycidyl Rosin methacrylate methacrylate Rosin glycidyl (RGMA) (RGMA) O O O OO O HO HO HO OO O OO MM 6336, 7271, 7940, 7969 n== 6336, 7271, 7940, 7969 O n Mn = 6336, 7271, 7940, 7969 Poly-(RGMA-co-MAPEG) Poly-(RGMA-co-MAPEG) Scheme66. 66.Preparation Preparation Scheme of comb-like surfactants. Poly-(RGMA-co-MAPEG) Scheme 66. Preparation of ofcomb-like comb-likesurfactants. surfactants. Scheme 66. Preparation ofglycols comb-like Polyesters ofacrylated acrylated rosin and polyethylene can be according Polyesters of acrylated rosin andand polyethylene glycols can besurfactants. prepared according toto Scheme 6767[125]. Polyesters of rosin polyethylene glycols can beprepared prepared according toScheme Scheme 67 [125]. They can be used as surfactants in preparation of stable emulsions [125]. They canThey be used in preparation of stable [125]. [125]. [125]. can as be surfactants used as surfactants in preparation of emulsions stable emulsions Polyesters of acrylated rosin and polyethylene glycols can be prepared according to Scheme 67 [125]. They can be used as surfactants in preparation of stable emulsions [125]. Molecules 2019, 24, 1651 31 of 52 Molecules 2019, 24, x FOR PEER REVIEW Molecules 2019, 24, x FOR PEER REVIEW Molecules 2019, 24, x FOR PEER REVIEW COOH COOH COOH COOH COOH COOH 31 of 51 31 of 51 31 of 51 O O CO CO C O O HO-[(CH2)2O]x-H HO-[(CH O]x-H ZnO22))22O] HO-[(CH x-H 270°C, 6-8h ZnO ZnO 6-8h 270°C, 270°C, 6-8h ( (( ) )) O O x O O x O x O HO HO HO COOH COOH Mn = 864-3082 Mn = 864-3082 polyethylene glycol n Mn = 864-3082 O O Polyester O Acrylated rosin COOH Acrylated rosin Acrylated rosin n of acrylated rosin and n Polyester of acrylated rosin and polyethylene glycol Polyester of acrylated rosin and polyethylene glycol Scheme 67. Preparation of acrylated rosin/polyethylene glycol polyester. Scheme 67. Preparation of acrylated rosin/polyethylene glycol polyester. Scheme 67. Preparation of acrylated rosin/polyethylene glycol polyester. Scheme 67. Preparation of acrylated rosin/polyethylene glycol polyester. Rosinimide imidepolyethers polyethersare arelight light brown brown solids. solids. They rosin, poly(ethylene Rosin Theycan canbe beprepared preparedfrom from rosin, poly(ethylene Rosin imide polyethers are light brown solids. They cansuch be prepared from rosin, poly(ethylene glycol) and polyamines according to Scheme 68, and using separation methods as as washing, imide polyethers are light brown solids. They can be prepared from methods rosin, poly(ethylene glycol) Rosin and polyamines according to Scheme 68, and using such separation washing, glycol) precipitation and polyamines according to SchemeThey 68, and using such separation methods as washing, drying, and filtration [250,251]. can be applied as petroleum crude oil sludge glycol) and polyamines according to Scheme 68, and using such separation methods as washing, drying, precipitation and be applied applied as as petroleum petroleumcrude crudeoiloilsludge sludge drying, precipitation andfiltration filtration[250,251]. [250,251]. They They can can be dispersants [250]. drying, precipitation and filtration [250,251]. They can be applied as petroleum crude oil sludge dispersants [250]. dispersants [250]. dispersants [250]. COOH COOH Levopimaric Levopimaric acid Levopimaric acid acid 135°C in DMF DMF 2h COO in135°C 135°C 2h COO 2h COO PEG PEG maleopimarate PEG maleopimarate R = -(CHmaleopimarate 2)4- or -[(CH2)2]NH]2(CH2)2- COO COO COO Rosin imide Rosin imide yield: Rosin85-95% imide yield: 85-95% yield: 85-95% R R NR N N in DMF5h 170°C, 170°C, 5h H N O )m H H ( N H O )m H ( N O )m H O( H O H O HO O O )n)n )n )n)n )n O O O 140°C, O O 1h O 240°C Zn 140°C, 1h Zn 140°C, 1h 240°C COOH 240°C R NH2 R NH N R NH22 O H N O HO H O N ( H O O )m H O HO HO O HO ( O )mH O in( DMF O )m O 170°C, 5h in DMF (( ( O O O O H O NH2 O H O HO R NH NH2 2 O O R NH2 O NH2 O inRDMF NH2 )n)n )n HO HO Zn HO O O O (( ( (( ( )n)n )n O O O (( ( H H HO O O COO COO COO Mn = 2310-3610 g/mol M = 2310-3610 g/mol Mnn= 2310-3610 Rosing/mol imide ether Rosin imide ether yield:imide 80-93% Rosin ether yield: 80-93% Scheme 68. Preparation of non-ionic rosin imide polyethers. yield: 80-93% R = -(CH2)4- or -[(CH2)2]NH]2(CH2)2R = -(CH2)4- or -[(CH2)2]NH]2(CH2)2- Scheme 68.Preparation Preparation ofnon-ionic non-ionic rosin rosin imide imide polyethers. Scheme polyethers. Scheme68. 68. Preparationof of non-ionic rosin imide polyethers. 3.3.5. Sorbents 3.3.5. Sorbents 3.3.5. Sorbents 3.3.5.Rosin-poly(acrylamide) Sorbents star copolymers can be prepared according to Scheme 69, prior to Rosin-poly(acrylamide) star copolymers can be prepared prepared according to Scheme 69, prior toto Rosin-poly(acrylamide) star copolymers can according to Scheme69, 69,prior priorto Soxhlet extraction using acetone and drying [243,244,252]. They canaccording be used forto wastewater treatment Rosin-poly(acrylamide) star copolymers can be be prepared Scheme Soxhlet extraction using acetone and drying [243,244,252]. They can be used for wastewater treatment Soxhlet extraction using acetone and drying [243,244,252]. They can for bewastewater used for wastewater [243,244,252] and as a matrix for Fe 3Odrying 4 nanoparticles [253].They can Soxhlet extraction using acetone and [243,244,252]. be used treatment [243,244,252] and as aand matrix for Fe3O4for nanoparticles [253]. treatment [243,244,252] as a matrix Fe O nanoparticles [253]. 3 4 [243,244,252] and as a matrix for Fe3O4 nanoparticles [253]. NaBH4 NaBH4 NaBH in diethyl 4 inether diethyl in diethyl 25°C, 24h ether ether24h 25°C, OH 25°C, 24h OH C OH C OC O acid O Rosin Rosin acid Rosin acid O O O NH 2 NHO 2 NH2 O N O N N HN HN H in HHO K2S2O H8 H2 O O ON OH OH OH Rosin alcohol Rosin alcohol Rosin alcohol O [ O O [ [ O [ O [ O [ K2S65°C, 2hH2O 2O8 in K2S2O8 in H2O 65°C, 2h 65°C, 2h Mn=?? M =?? Mnn=?? NH2 NH2 NHO 2 O ]n O ]n ]]nn ] ]nnO O NH2 O NH2 NH2 H H NH N ON O O H H NH N ON O O O O NO N HN H H O O NO N HN H H H2N H2N OH 2N O O[ [ [[ [ O [ O H2N O H2N H2N O ]n O ]n O ]n]nO ] ]nn OO Rosin-poly(acrylamide) Rosin-poly(acrylamide) Rosin-poly(acrylamide) Scheme 69. Synthesis of rosin alcohol and rosin-poly(acrylamide) star copolymer. Scheme 69. Synthesis of rosin alcohol and rosin-poly(acrylamide) star copolymer. Scheme Synthesisofofrosin rosinalcohol alcohol and and rosin-poly(acrylamide) rosin-poly(acrylamide) star Scheme 69.69.Synthesis starcopolymer. copolymer. Linear rosin-modified cationic poly(acrylamide) can be prepared from dehydroabietyl chloride, Linear rosin-modified cationic poly(acrylamide) can be prepared from dehydroabietyl chloride, bromopropan-1-ol, methyldiallylamine, acrylamide and dimethyl ammonium chloride in a Linear rosin-modified cationicpoly(acrylamide) poly(acrylamide) be from dehydroabietyl chloride, Linear rosin-modified cationic candiallyl be prepared prepared from dehydroabietyl chloride, bromopropan-1-ol, methyldiallylamine, acrylamide and diallyl dimethyl ammonium chloride in a few-step process, according to Scheme 70,acrylamide followed byand operations such as filtration, washing, drying bromopropan-1-ol, methyldiallylamine, acrylamide diallyl ammonium chloride in in a a bromopropan-1-ol, methyldiallylamine, and diallyl dimethyl dimethyl ammonium chloride few-step process, according to Scheme 70, followed by operations such as filtration, washing, drying and recrystallization [149]. Its utilization may be in flocculation processes [149]. few-step process, according to Scheme 70, followed by operations such as filtration, washing, drying few-step process, according to Scheme 70, followed by operations such as filtration, washing, drying and recrystallization [149]. Its utilization may be in flocculation processes [149]. recrystallization [149].ItsItsutilization utilizationmay maybe be in in flocculation flocculation processes andand recrystallization [149]. processes[149]. [149]. Molecules 2019, 24, x FOR PEER REVIEW 32 of 51 Dehydroabietic acid bromopropyl ester Molecules 2019, 24, x FOR PEERNREVIEW yield: 67% Molecules 2019, 24, x FOR PEER REVIEW O Molecules 2019, 24, 1651 m CH2 NH2 Cl NO O n Br in THF 65°C, 48h 65°C, 48h 55°C, 8h C O C O O O O O O NBr Br Diallylmethlyl N Cl 32 of 51 NH2 n m CH2 O C N NBr Br AIBA10h 50°C, 50°C, 10h O O Diallylmethlyl dehydroabietic acid propyl Br Br p N Br Dehydroabietic acid Dehydroabietic acid in C2H5OH C bromopropyl ester m AIBA NH2 O N bromopropyl ester 65°C,N48h O m 50°C, 10h NH2 Br yield: 67% N yield: 67% Cl C Diallylmethlyl O Br ClN O n dehydroabietic acid propyl n N (C2H5)3N in C2H5OH C ester ammonium bromide AIBA in C2H5OH N C O HO 32 of 52 O 32 of 51 CH2 Hydrophobically O modifiedcationic O n NH2 m N polyacrylamide n NH2 m N O p p Cl Cl Mn=?? Hydrophobically Hydrophobically modifiedcationic modifiedcationic polyacrylamide polyacrylamide O C O C dehydroabietic acid propyl (C2H5)3N ester ammonium bromide H5)3N HO Br (C ester ammonium bromide Dehydroabietyl in2THF HO Br in THF 55°C, 8h O C Cl chloride 55°C, 8h Mn=?? Mn=?? Scheme 70. Preparation of linear rosin-poly(acrylamide) copolymer. Dehydroabietyl Dehydroabietyl C Cl tetraethylenepentamine O Rosin chloride amide is a solid. It can be prepared from maleopimaric acid and O C Cl chloride tetraethylenepentamine according to Scheme 71, prior to precipitation, washing and lyophilization Scheme 70.Preparation Preparationof oflinear linear rosin-poly(acrylamide) rosin-poly(acrylamide) copolymer. Scheme 70. copolymer. Scheme 70. Preparation of linear rosin-poly(acrylamide) copolymer. [115]. It creates nano-micelles in aqueous solutions and can act as a sorbent and sinking agent in metal ions removal [115]. Rosin tetraethylenepentamine amideisisaasolid. solid. It It can be prepared from maleopimaric acid and Rosin tetraethylenepentamine preparedfrom frommaleopimaric maleopimaric acid and Rosin tetraethylenepentamineamide amide is a solid. It can be prepared acid and tetraethylenepentamine according to Scheme 71, prior to precipitation, washing and lyophilization tetraethylenepentamine according to Scheme 71, prior to precipitation, washing and lyophilization [115]. O tetraethylenepentamine according to Scheme 71, prior to precipitation, washing and lyophilization COOH H2N Maleopimaric NH [115]. Itnano-micelles creates nano-micelles in aqueous solutions and can act as a sorbent and sinking agent in metal It creates in aqueous solutions and can act as a sorbent and sinking agent in metal ions Rosin acid [115]. It creates nano-micelles in aqueous solutions and can act as a sorbent and sinking agent in metal O ions removal [115]. O tetraethylenepentamine removal [115]. H ions removal [115]. amide ( N )3 NH2 H2N HN NH H2N O N O COOH Maleopimaric 60°C, 12h H2N NH O COOH H Maleopimaric COOH Rosin NH acid COOH Rosin O acid O tetraethylenepentamine O H O tetraethylenepentamine N amide Scheme Preparation amide. (H )3 NH2of rosin-tetraethylenepentamine H2N 71. HN NH N amide ( ) NH 3 2 N O H2N HN NH COOH 3.3.6. Organosilicons COOH O 60°C, 12h 60°C, 12h NH H COOH COOH Scheme of rosin-tetraethylenepentamine amide. Rosin glycidyl ester is 71. a Preparation brown, viscous liquid. It can be synthesized from rosin and Scheme amide. Scheme71. 71.Preparation Preparation of of rosin-tetraethylenepentamine rosin-tetraethylenepentamine amide. epichlorohydrin according to Scheme 72 without further purification [254]. It can be used for 3.3.6. Organosilicons preparation of cross-linking agent for silicone rubber [254]. 3.3.6. Organosilicons 3.3.6. Organosilicons Rosin-modified room-temperature-vulcanized silicone be prepared from Rosin glycidyl ester is a brown, viscousIt liquid. It rubber can be can synthesized from rosinrosin and Rosin glycidyl esterester is a brown, viscous viscous liquid. can be synthesized from rosin and epichlorohydrin Rosin glycidyl is a brown, liquid. It can be synthesized from rosin and glycidyl ester, aminopropyltrietoxysilane, tetraetoxysilane and hydroxyl-terminated epichlorohydrin according to Scheme 72 without further purification [254]. It can be used for according to Schemeaccording 72 without purification [254]. It can be used for[254]. preparation epichlorohydrin tofurther 72 further purification can of becross-linking used for polydimetoxysilane according toScheme Scheme 72 without [254]. Rosin-modified silicones showsItsignificantly better preparation of cross-linking agent for silicone rubber [254]. agent for silicone rubber [254]. preparation cross-linking agent for rubber [254]. thermal and of mechanical properties in silicone comparison with unmodified silicone [254–256]. Rosin-modified room-temperature-vulcanized silicone rubber can be prepared from rosin Rosin-modified room-temperature-vulcanized silicone rubber can be prepared from rosin glycidyl ester, aminopropyltrietoxysilane, tetraetoxysilane and hydroxyl-terminated glycidyl ester, O aminopropyltrietoxysilane, Otetraetoxysilane and hydroxyl-terminated ( ) H N polydimetoxysilane according to2Scheme 72 [254]. Rosin-modified silicones shows significantly better Cl polydimetoxysilane according to Scheme O72 [254]. Rosin-modified silicones Si O HO ( Si shows O ) H significantly better n thermal and NaOH mechanical propertiesOinSicomparison with unmodified silicone [254–256]. O thermal and TEBAC mechanical properties in comparison with unmodified silicone [254–256]. O 117-60°C 5h O Cl O Cl COOH NaOH Rosin 80°C, 1h O H2N H2N O Si O C O Si O O O O NaOH TEBAC TEBAC 117-60°C 117-60°C O 5h O 5h Rosin glycidyl O COOH COOH NH O O OH Si O Si O C O OO O ( ) ( (X) ) O (Y) Rosin-modified 80°C, 1h NH 80°C, 1haminopropyltrietoxysilane ester OH NH OH C yield: 92% yield: 100% C O C (Y) O C O O (Y) O Si O HO ( Si O ) H O O nH HO ( Si ) n dibutyltin O O dilaurate O Si O 25°C, O Si 0.25h O (X) O O (X) Y X X Y Y Y X X X Y Y X Y X Y Xmodified Y X Rosin X Y X silicone X Yrubber X yield:Y 100% X Y Y X Y dibutyltin O Rosin Scheme 72. Preparation dibutyltin room-temperature-vulcanized silicone rubber. O of rosin-modifiedRosin-modified Rosin modified dilaurate 72. Preparation of rosin-modified room-temperature-vulcanized silicone rubber. RosinScheme O Rosin-modified Rosin modified dilaurate 25°C, 0.25h RosinOglycidyl ester aminopropyltrietoxysilane 25°C, silicone rubber 0.25h Rosinyield: glycidyl ester aminopropyltrietoxysilane silicone rubber 92% 100% yield:rosin 100% Maleated rosin-modified vinyl fluorosiliconeyield: resin canrubber be prepared from maleopimaric acid and Rosin-modified room-temperature-vulcanized silicone can be prepared from yield: 92% yield: 100% yield: 100%glycidyl siloxanes according to Scheme 73 prior to vacuum evaporation [116]. It can be used in preparation of ester, aminopropyltrietoxysilane, and hydroxyl-terminated polydimetoxysilane Scheme 72. Preparation of tetraetoxysilane rosin-modified room-temperature-vulcanized silicone rubber. Scheme 72. Preparation of rosin-modified room-temperature-vulcanized silicone rubber. fluorosilicone rubber, having improved mechanical and thermal properties in comparison with according to Scheme 72 [254]. Rosin-modified silicones shows significantly better thermal and unmodified sample [116]. Maleated rosin-modified vinyl fluorosilicone resin can be prepared from maleopimaric acid and mechanical properties in comparison with unmodified [254–256]. Maleated rosin-modified vinyl fluorosilicone resin silicone can be prepared from maleopimaric acid and siloxanes according to Scheme 73 prior to vacuum evaporation [116]. It can be used in preparation of Maleated rosin-modified vinyl fluorosilicone can be prepared from maleopimaric acidof and siloxanes according to Scheme 73 prior to vacuumresin evaporation [116]. It can be used in preparation fluorosilicone rubber, having improved mechanical and thermal properties in comparison with siloxanes according to Scheme 73 prior to vacuum evaporation [116]. It can be used in preparation fluorosilicone rubber, having improved mechanical and thermal properties in comparison with unmodified sample [116]. of unmodified fluorosilicone rubber, having improved mechanical and thermal properties in comparison with sample [116]. unmodified sample [116]. Molecules 2019, 24, 1651 33 of 52 Molecules2019, 2019,24, 24,xxFOR FORPEER PEERREVIEW REVIEW Molecules Molecules 2019, 24, x FOR PEER REVIEW H2N H2N 3333of of 5151 33 of 51 F3C Si O F3C Si O HN Si ++HO (2 Si O ) H++ F3C OOSi OSi nH HO Si O + + F3C Si O ( ) n Siloxane 1 Siloxane OSi OSi ( Si O )n22H F3C Siloxane 1 HO Siloxane Si O3 Siloxane Siloxane 1 Siloxane 2 F3CSiloxane 3 Siloxane 3 KOH Si O Si Si O Si Si O Si KOH 100°C, 12h KOH 12h 100°C, CF100°C, 12h H2N H2N H2N CF3+ CF3+ CF + 3 O Si O Si O Si Si O Si O Si O Si Si O Si O O O Si O Si Si O 4 Siloxane Siloxane 4 Siloxane 4 HOOC HOOC HOOC 3 CF3 CF3 Si O ( Si O)a ( Si O )b ( Si O )c Si Si O ( Si O)a ( Si O )b ( Si O )c Si Si OVinyl O )c Si ( Si Ofluorosilicone )a ( Si O )b ( Si resin 150°C, 4h 150°C, 4h 150°C, 4h COOH COOH COOH O O O O O OO O O O O O N N N CF3 O CF3 O CF3 O Si O ( Si O )a ( Si O )b ( Si O )c Si Si O ( Si O )a ( Si O )b ( Si O )c Si Si O ( Si O )a ( Si O )b ( Si O )c Si Maleated rosin-modified Maleated rosin-modified vinyl fluorosilicone resin Maleated rosin-modified vinyl fluorosilicone resin Vinyl fluorosilicone resin vinyl fluorosilicone resin Vinyl fluorosilicone resin Scheme Preparationof ofmaleated maleated rosin-modified resin. Scheme 73.73. Preparation rosin-modifiedvinyl vinylfluorosilicone fluorosilicone resin. Scheme 73. Preparation of maleated rosin-modified vinyl fluorosilicone resin. Scheme 73. Preparation of maleated rosin-modified vinyl fluorosilicone resin. 3.3.7. Polysaccharides 3.3.7. Polysaccharides 3.3.7. Polysaccharides Superhydrophobicwood woodcan can be be prepared prepared using using maleated chloride and and 3.3.7. Polysaccharides Superhydrophobic maleatedrosin, rosin,aluminum aluminum chloride Superhydrophobic woodto can be prepared using maleated rosin, aluminum chloride and tetrabutyltitanate according Scheme 74 [119]. Such a hydrophobic material is appreciated in in tetrabutyltitanate according to Scheme 74 [119]. using Such a hydrophobic material is chloride appreciated Superhydrophobic wood be prepared rosin,material aluminum and tetrabutyltitanate according to can Scheme 74 have [119].been Such amaleated hydrophobic is appreciated in construction. Related starch-rosin materials also prepared [120]. construction. Relatedaccording starch-rosin materials also prepared [120]. tetrabutyltitanate to Scheme 74have [119].been Such a prepared hydrophobic material is appreciated in construction. Related starch-rosin materials have been also [120]. construction. Related materials have been also prepared [120]. OHstarch-rosin OH OH OH OH OH OH OH OH OH OH OH OH Wood Wood Wood COOH OH OH Maleated rosin AlCl Maleated3rosin Ti(OC4H9)4 Maleated AlCl3rosin in H2O/NH AlCl 3/C 329H Ti(OC )45OH 4H 25-180°C, 41h Ti(OC H 4 9 in H O/NH /C H)4OH 2 COOH COOH COOH 3 COOH COOH COOH COOH COOH O HO O HO O O O HO O O 2 5 in H25-180°C, H5OH 2O/NH3/C241h 25-180°C, 41h O O O O O O HO Ti O O O O O O OO Ti O HO O HO Ti O O Superhydrophobic-surface wood O O O O O O O O O O AlO O OO O Al Al O O Superhydrophobic-surface wood Scheme 74. Preparation of rosin-impregnated superhydrophobic wood. Superhydrophobic-surface wood Scheme74. 74.Preparation Preparation of of rosin-impregnated rosin-impregnated superhydrophobic wood. Scheme superhydrophobic wood. Rosin-esterified starch can be prepared according to Schemewood. 75, prior to filtration, Scheme 74. biopolymer Preparation of rosin-impregnated superhydrophobic precipitation, washing and drying [257,258]. Rosin decreases solubility and swelling of starch, which Rosin-esterifiedstarch starchbiopolymer biopolymer can can be be prepared prepared according to to filtration, Rosin-esterified accordingtotoScheme Scheme75, 75,prior prior filtration, potentially allows tostarch use this polymer incan foodbeand biomedical materials [257]. 75, prior to filtration, Rosin-esterified biopolymer prepared according to Scheme precipitation, washing anddrying drying[257,258]. [257,258]. Rosin Rosin decreases starch, which precipitation, washing and decreasessolubility solubilityand andswelling swellingofof starch, which precipitation, washing and drying [257,258]. Rosin decreases solubility and swelling of starch, which potentially allows to use this polymer in food and biomedical materials [257]. potentially allows to use this polymer in food and biomedical materials [257]. potentially allows to use this polymer in food and biomedical materials [257]. OH OH OHOH OH OH OH HO O OH Starch O OH O OH Starch Starch n+m n+m n+m O lipase HO1-4h O in DMSO 40°C, HO O O O OH OH OH O OH OH lipase Degree1-4h of substitution: m OH lipase in DMSO 40°C, O 0.031-0.092 in DMSO 40°C, 1-4h Rosin acid starch O OH Degree of substitution: m OH Degree of substitution: 0.031-0.092 m Scheme 75. Preparation of rosin-esterified starch. Rosin acid starch 0.031-0.092 OH OH OH O O O O O OH O OH O OH n n n Rosin acid starch Scheme 75. Preparation of rosin-esterified starch. Cellulose nanofibers and nanocrystals surface-modified by rosin can be prepared according to Scheme75. 75. Preparation of rosin-esterified Scheme rosin-esterifiedstarch. starch. Scheme 76, prior to washing in ethanolPreparation [259,260]. They can be used as antibacterial reinforcements in Cellulose nanofibers and nanocrystals surface-modified can be according bio-based package films [260]. In similar way hemp fibers canby berosin modified byprepared tall oil rosin acids into Cellulose nanofibers and nanocrystals surface-modified by can according to to Cellulose nanofibers and nanocrystals surface-modified byrosin rosin canbebeprepared prepared according Scheme 76, prior to washing in ethanol [259,260]. They can be used as antibacterial reinforcements in order to improve the reinforcement adhesion to an epoxy matrix [261]. Scheme 76, prior to washing in ethanol [259,260]. can be used as antibacterial reinforcements in in Scheme 76, prior to washing in ethanol [259,260]. They can be used as antibacterial reinforcements bio-based package films [260]. In similar way hemp fibers can be modified by tall oil rosin acids in bio-based package films [260]. In similar way hemp fibers can be modified by tall oil rosin acids in bio-based films [260]. In similar waytohemp fibers can be modified by tall oil rosin acids in order to package improve the reinforcement adhesion an epoxy matrix [261]. order improve the reinforcementadhesion adhesionto toan anepoxy epoxy matrix matrix [261]. order to to improve the reinforcement [261]. Molecules 2019, 24, 1651 34 of 52 Molecules 2019, 24, x FOR PEER REVIEW Molecules 2019, 24, x FOR PEER REVIEW Molecules 2019, 24, x FOR PEER REVIEW Molecules 2019, 24, x FOR PEER REVIEW O OH OH OH OH HO HO HO O HO O O O OH OH OH OH O O OH O HO OH HO OH HO Cellulose OH HO OH OH OH nanofibers OH Cellulose nanofibers n n n n 34 of 51 OH Rosin Rosin Rosin O/HCl in H2Rosin in H2O/HCl in H2O/HCl 130°C, 24h in H2O/HCl 130°C, 24h 130°C, 24h 130°C, 24h O O O OHO HO HO HO HO HO HO OHO O O O OH OH OH OH 34 of 51 34 of 51 34 of 51 R = abietate R or = abietate pimarate R = abietate or pimarate R abietate or =pimarate Degreeorofpimarate substitution: Degree substitution: 0.05 of Degree of substitution: 0.05 Degree 0.05 of substitution: 0.05 OH OH OH OH O OH OH OH n RO n R O n O R modified cellulose nanofibers n R modified cellulose nanofibers Rosin Cellulose nanofibers Rosin Cellulose nanofibers Rosin modified cellulose nanofibers Rosin modified cellulose nanofibers Scheme 76. 76. Preparation Preparationof ofrosin-modified rosin-modified cellulose nanofibers. Scheme cellulose nanofibers. Scheme Scheme 76. 76. Preparation Preparation of of rosin-modified rosin-modified cellulose cellulose nanofibers. nanofibers. Scheme 76. Preparation of rosin-modified cellulose nanofibers. Chitosan grafted grafted by by rosin rosin acrylate acrylate is is aa solid. solid. ItIt can can be be prepared prepared from from chitosan chitosan and and rosin rosin acid acid Chitosan Chitosan grafted by rosin acrylate is aa solid. It can be prepared from chitosan and rosin acid Chitosan grafted by rosin acrylate is solid. It can be prepared from chitosan and rosin acid hydroxyethyl acrylate according Scheme prior toItprecipitation, filtration, washing and drying [172]. Chitosan grafted by rosintoacrylate is77a77 solid. can be prepared from chitosan and rosin acid hydroxyethyl acrylate according toto Scheme prior to precipitation, filtration, washing and drying hydroxyethyl acrylate according 77 prior filtration, hydroxyethyl acrylate according to Scheme Scheme 77applications prior to to precipitation, precipitation, filtration, washing washing and and drying drying It can be potentially used in controlled release [172]. hydroxyethyl acrylate according to Scheme 77 prior to precipitation, filtration, washing and drying [172]. It can be potentially used inincontrolled release applications [172]. [172]. [172]. It It can can be be potentially potentially used used in controlled controlled release release applications applications [172]. [172]. [172]. It can be potentially used in controlled release applications [172]. RR OO R O R O OO O K S OO OHOH OH OH O O O OO K2KS22SO 288 O O 2 2O 8 O K2S2COOH OCOOH 2 NHNH 8 inin H2H O/CH HOHO 2 NH2 2O/CH 3 33COOH in H O/CH HO 2O/CH COOH NH2 n in H HO Chitosan 3 n n60°C, 60°C,2h; 2h; microwaves Chitosan 60°C,22h;microwaves microwaves Chitosan n 60°C, 2h; microwaves Chitosan OO O O HO HO HO HO [[[ [O OO O OH OH OH NH NH NH m ]]m m ]m O O O O RR == R= R= O O O O nnChitosan graft Chitosangraft graft n Chitosan n Chitosan graft RR R R rosin rosinacrylate acrylate rosin acrylate rosin acrylate copolymer copolymer copolymer copolymer O O O O O O O O Grafting percentage: Grafting percentage: Grafting percentage: 72.3% Grafting percentage: 72.3% 72.3% 72.3% Scheme 77. Preparation of chitosan graft Scheme 77. Preparation of chitosan graftrosin rosinacrylate acrylatecopolymer. copolymer. Scheme 77. rosin acrylate copolymer. Scheme 77.Preparation Preparationof ofchitosan chitosan graft graft acrylate copolymer. Scheme 77. Preparation of chitosan graft rosin acrylate copolymer. 3.3.8. Other Materials 3.3.8. Other Materials 3.3.8. Other Materials 3.3.8. Other Materials 3.3.8. Other Materials Dehydroabietic acid-glycerol carbonate product canbe beprepared preparedfrom fromdehydroabietic dehydroabietic acid and Dehydroabietic acid-glycerol carbonate product can acid and Dehydroabietic acid-glycerolcarbonate carbonateproduct product can can be prepared from dehydroabietic acid and Dehydroabietic acid-glycerol be preparedfrom fromdehydroabietic dehydroabieticacid acid and Dehydroabietic acid-glycerol carbonate product canbe beapplied prepared and glycerin carbonates according to Scheme 78 [262]. It can be applied in xerographic tonners [262]. glycerin carbonates according to Scheme 78 [262]. It can in xerographic tonners [262]. glycerin carbonates according to Scheme78 78 [262]. ItIt can can be applied applied in xerographic tonners [262]. glycerin carbonates according inxerographic xerographictonners tonners[262]. [262]. glycerin carbonates accordingtotoScheme Scheme 78[262]. [262]. It can be be applied in O (1) O (2) O (3) O (4) O O (1) O (2) O (3) O (4) O O O (1)(1) O O DA (2)(2)O O DA (3) (4) DA DA (3)OO (4) O O DA DA DA DA O O DA O O DA DA O DA O DADA O DA O DA O R O O O O O O O R O O O O O O O O R R (C2H5)4N I OH OH (C2H5)4N I R R OH OH 12hI (C (C2150°C, H 5)4IN 52)H 4N OH O OH 150°C, 12hR R OH OHOH O OH O OH OH O O O 150°C, 12h 150°C, 12h COOH OH OH O O O OH OH OO OO COOH Dehydroabietic O Dehydroabietic OO COOH O DA COOH O Dehydroabietic O DA acid-glycerin Dehydroabietic Dehydroabietic acid-glycerin O Dehydroabietic acid acid DA DA ++ ++ ++ ++ ++ ++ (5) (5) (5) (5) O O O O ++ HO HO + HO O O O O O O O O O O O O acid-glycerin carbonate Dehydroabietic acid acid-glycerin Dehydroabietic acid carbonate product product yield: yield: 99% 99% carbonateproduct product yield: yield:99% 99% carbonate DA DA DA DA (6) (6) (6) (6) O O OO DA DA DA DA R = H, or CH2OH R = H, or CH2OH CH 2OH RR= =H,H, oror CH 2OH O O OO DA = DA = DA= = DA O O OO DA DA O O DA DA O O DA O DA O OO OO DA DA OO DA DA DA DA ++ ++ Scheme 78. Preparation of xerographic toner. Scheme78. 78.Preparation Preparation of of rosin-glycerin rosin-glycerin carbonate carbonate xerographic Scheme rosin-glycerin carbonatexerographic xerographictoner. toner. Scheme Preparationof ofrosin-glycerin rosin-glycerin carbonate carbonate Scheme 78.78.Preparation xerographictoner. toner. Rosin-polyphthalate resin glossy light maleopimaric Rosin-polyphthalateresin resinisis isaaaglossy glossy light light yellow yellow solid. solid. ItItcan can be prepared from maleopimaric Rosin-polyphthalate yellow solid.It canbe beprepared preparedfrom from maleopimaric Rosin-polyphthalate resin is a glossy lightaccording yellow solid. It can be prepared from maleopimaric acid, and phthalic anhydride-glycerol polyester to Scheme 79 prior to vacuum [117]. Rosin-polyphthalate resin is a glossy light according yellow solid. It can 79 be prepared from drying maleopimaric acid, and phthalic anhydride-glycerol polyester to Scheme prior toto vacuum drying [117]. acid, and phthalic anhydride-glycerol polyester to Scheme 79 prior vacuum drying [117]. acid, and phthalic anhydride-glycerol polyester according to Scheme 79[117]. prior to vacuum drying [117]. Its application is an environmentally-friendly phenol-free printing ink acid, and phthalic anhydride-glycerol polyester according to Scheme 79 prior to vacuum drying [117]. Its application is an environmentally-friendly phenol-free printing ink [117]. Its Its application is is ananenvironmentally-friendly printing ink ink[117]. [117]. application environmentally-friendlyphenol-free phenol-free printing Its application is an environmentally-friendly phenol-free printing ink [117]. O COOH COOH COOH O O O O O O OO O O O Maleopimaric acid Maleopimaric acid COOH Maleopimaric acid Maleopimaric acid R OH R OH R OH OH R OH R R OH R OH R OH OH R R OH R OH 260°C, 2h 260°C, 2h R OH2h 260°C, 260°C, 2h O O R O R R O O O R O OO O O O R O R O RO OH OH COO OH OH COO O R OH OH COO R R R R R R OH R OH R R COO R R R HO HO R R R R HO R= R R HO OH OH R= OH R OH R R= O OH OH O R= OH O OHOH OH O O OH OH O O O OH R OH O O R R R O O Rosin-based ROHROH Rosin-based R Rosin-based R phenol-free phenol-free Rosin-based phenol-free resin resin resin phenol-free Scheme Scheme 79. 79. Preparation Preparation of of rosin-based rosin-based phenol-free phenol-free resin. resin.resin Scheme rosin-basedphenol-free phenol-freeresin. resin. Scheme79. 79.Preparation Preparation of rosin-based Scheme Preparation of rosin-based phenol-free resin. Rosin propargyl ester is aa79. white, transparent liquid. It can be synthesized from rosin chloride Rosin propargyl ester iswhite, white, transparent liquid. It can be synthesized from rosin chloride Rosin propargyl ester is a transparent liquid. It can be synthesized from rosin chloride and Rosin propargyl ester is a white, transparent liquid. It can be synthesized from rosin chloride and propargyl alcohol according to Scheme 80, prior to washing and column chromatography and propargyl alcohol according to Scheme 80, prior to washing and column chromatography [147]. [147]. propargyl alcohol according 80, prior washing chromatography [147]. It can and propargyl alcohol according to Scheme 80, to prior to washing and column chromatography [147]. Rosin propargyl ester istoa Scheme white, transparent liquid. Itand cancolumn be synthesized from rosin chloride It It can can be be used used to to prepare prepare caprolactone caprolactone graft graft copolymers copolymers [147]. [147]. be used to prepare caprolactone graft copolymers [147]. It can be used to prepare caprolactone graft copolymers [147]. and propargyl alcohol according to Scheme 80, prior to washing and column chromatography [147]. Rosin Rosin ester ester containing containing poly(α-azide-ε-caprolactone) poly(α-azide-ε-caprolactone) can can be be prepared prepared from from rosin rosin propargyl propargyl ester, ester, Rosin ester containing poly(α-azide-ε-caprolactone) can be from rosin propargyl ester, Rosin ester containing poly(α-azide-ε-caprolactone) can beprepared prepared from rosin propargyl ester, It can be used to prepare caprolactone graft copolymers [147]. α-chloro-ε-caprolactone and sodium azide according to Scheme 80, and using such separation α-chloro-ε-caprolactone and sodium azide according to Scheme 80, and using such separation α-chloro-ε-caprolactone and sodium azide according to Scheme 80,using and using such separation α-chloro-ε-caprolactone and sodium azide according to Scheme and such separation methods Rosin ester containing poly(α-azide-ε-caprolactone) can be80, prepared from rosin propargyl ester, methods as and copolymer shows properties methods as centrifugation centrifugation and vacuum vacuum drying drying [147]. [147]. This This biodegradable biodegradable copolymer shows properties methods as centrifugation and vacuum drying [147]. This biodegradable copolymer shows properties α-chloro-ε-caprolactone and sodium azide according to Scheme 80, and using such separation methods as centrifugation and vacuum drying [147]. This biodegradable copolymer shows properties Molecules 2019, 24, x FOR PEER REVIEW 35 of 51 similar to poly(methyl acrylate) [263]. Similar polymers with quaternary ammonium groups showing antimicrobial properties can be also prepared [264]. Molecules 2019, 24, 1651 Acrylic rosin methacryl diester can be prepared from acrylic rosin and 2-hydroxyethyl35 of 52 methacrylate according to Scheme 81, prior to rotary evaporation and vacuum drying [124]. It can be used as acrylic monomer orREVIEW resin [124]. Molecules 2019, 24, x FOR PEER 35 of 51 as centrifugation and vacuum drying [147]. biodegradable copolymer shows properties similar Poly(styrene-co-acrylic rosin ester) canThis be prepared via suspension polymerization of acrylic to poly(methyl acrylate) [263]. Similar polymers with quaternary ammonium groups showing similar to poly(methyl acrylate) Similarto polymers quaternary ammonium groups showing rosin methacryl ester and styrene[263]. according Schemewith 81, prior to washing, filtration and vacuum antimicrobial can be also prepared [264]. antimicrobial properties can be prepared [264]. drying [124]. Its properties application isalso microspheres [124]. )n Acrylic rosin methacryl diester can be prepared from acrylic rosin and 2-hydroxyethyl methacrylate according to Scheme 81, prior to rotary evaporation and vacuum drying [124]. It can be Molecules 2019, 24,chloride x FOR PEER REVIEW 35 of 51 Dehydroabietyl Dehydroabietic propargyl ester O used as acrylic monomer or resin [124]. OH ester) can be prepared via suspension polymerization of acrylic Poly(styrene-co-acrylic rosin similar to poly(methyl acrylate) [263]. Similar polymers with quaternary ammonium groups showing rosin methacryl ester and styrene according to Scheme 81, prior to washing, filtration and vacuum (Ccan 2H5)be 3N also prepared [264]. antimicrobial properties CuI COCl [124]. Its application in CH2is Clmicrospheres drying [124]. 2diester DBU acrylic rosinO andO 2-hydroxyethyl O Acrylic rosin methacryl can be prepared from O 22°C, 24h )n in THF methacrylate according to Scheme 81, prior to rotary evaporation and vacuum drying [124]. ItNcan be 35°C, 12h N O Dehydroabietyl chloride or resinDehydroabietic N propargyl ester N3 used as acrylic monomer [124]. ( α-chloro-ε-caprolactone O of acrylic Cl Poly(styrene-co-acrylic rosin Rosin ester containing ( O can be prepared )n via suspension polymerization OH ester) poly(α-azide-ε-caprolactone) rosin methacryl ester and styrene according to Scheme filtration and vacuum O 81, prior to washing, Poly(α-azide(C2H5)3N CuI O COCl drying [124]. Its application is2microspheres [124]. O -ε-caprolactone) in CH Cl2 M = 10400, 11000, 12200 O N3 OH ( (O ))n n O nO N N N ( )n DBU O O in THF in DMF NaN3 25°C, 12h 35°C, 12h Cl Dehydroabietic propargyl ester 22°C, 24h 2-hydroxyethyl2-bromoisobutyrate Dehydroabietyl chloride α-chloro-ε-caprolactone Sn(II) 2-ethylhexanoate Cl in toluene 120°C, 12h O O Poly(α-chloro-ε-caprolactone) Rosin ester containing poly(α-azide-ε-caprolactone) O ( Poly(α-azide- O (C2H5)3N CuI O O -ε-caprolactone) DBU COCl in CH2Cl2 M = 10400, 11000, 12200 O rosin O n O Scheme 80. 80. Preparation of ester containing poly(α-azide-ε-caprolactone). Scheme Preparation of rosin ester containing poly(α-azide-ε-caprolactone). O in DMF in THF 2-hydroxyethyl- 22°C, 24h N NaN3 25°C, 12h 35°C, 12h N 2-bromoisobutyrate Cl O N N3 PDI=1.17-1.36 2-ethylhexanoate α-chloro-ε-caprolactone Acrylic rosinSn(II) methacryl diester can be prepared from acrylic rosin and 2-hydroxyethyl methacrylate COO COO COOH (O )n Poly(α-chloro-ε-caprolactone) in toluene O Cl Rosin ester containing (O )n according to Scheme120°C, 81, prior to rotary evaporation and 12h O vacuum drying [124]. It can be used as acrylic poly(α-azide-ε-caprolactone) O Poly(α-azideO O O O -ε-caprolactone) Scheme 80. Preparation of rosin ester containing poly(α-azide-ε-caprolactone). Mn = 10400, 11000, 12200 monomer orO resin [124]. HO O O AIBN ZnO, HQ in DMF 2-hydroxyethylO ( )n( )m O gelatin NaN3 25°C, 200-230°C 12h Cl 2-bromoisobutyrate PDI=1.17-1.36 in H O COOH COO COO 2 COO COO 3.5h Sn(II)COOH 2-ethylhexanoate O O <90°C, 5h (O O )n Poly(α-chloro-ε-caprolactone) Acrylic rosin in toluene ( )n( )m 120°C, 12hAcrylic O O O O rosin ethyl methacryl HO Poly(styrene-co-O O diester yield: 92% AIBN Scheme 80. Preparation of rosin ester containing poly(α-azide-ε-caprolactone). ZnO, HQ -acrylic rosin ester) O ( O 200-230°C COOH Acrylic rosin )n( gelatin in H2O rosin ester COO COO copolymer. 3.5h 81. Preparation Scheme of Ostyrene and acrylic O <90°C, 5h )m PDI=1.17-1.36 ( COO)n( )m Acrylic rosin ethyl methacryl Rosin-tung oil Diels-Alder adduct is a yellowish solid. It can be prepared from levopimaric acid Poly(styrene-coO O diester yield: 92% O HO to Scheme 82, prior toO precipitation and O and tung oil according drying [265,266]. Its application is a -acrylic rosin ester) AIBN ZnO, HQ promoter in polyurethane [265] filler, tackifier and adhesion and UV-curable O adhesives ( )n([266]. )m Scheme 81. Preparation of styrene and acrylic ester copolymer. O gelatin rosin 200-230°C Scheme 81. Preparation of styrene and acrylic ester copolymer. in H2O rosinCOO COOH COO 3.5h COOH COO O O O <90°C, 5h O Acrylic rosin ( from )n(levopimaric )m HOOCacid Rosin-tung oil Diels-Alder adduct is a yellowish solid. It can be prepared Acrylic rosin ethyl methacryl Poly(styrene-co-acrylic rosin ester) can be prepared via suspension polymerization O oil (CH and tung according to Scheme 82, prior to precipitation and drying [265,266]. Its application isofa acrylic 2)7 Poly(styrene-codiester yield: 92% rosin methacryl ester and styrene according to Scheme[265] 81, and prior to washing, filtration filler, tackifier and adhesion promoter in polyurethane UV-curable adhesives [266]. and vacuum -acrylic O rosin ester) O (CH ) O 2 7 drying [124]. Its application is 81. microspheres [124]. and acrylic rosin ester copolymer. Scheme Preparation of styrene O O HOOC O (CH2)7 O (CH2)7 Rosin-tung oil Diels-Alder adduct is a yellowish solid. It can be prepared from levopimaric acid O (CH2)7 oilto Diels-Alder adduct is ato yellowish solid. It can prepared from levopimaric acid O Obe (CH2)7 [265,266]. and tung oilRosin-tung according Scheme 82, prior precipitation and drying Its application is a O and to Scheme 82, prior to precipitation and drying [265,266]. Its application is a O (CH2)7 O tung oil O according filler, tackifier and adhesion promoter in polyurethane [265] and UV-curable adhesives [266]. O Tung oil (CH ) O 7 filler, tackifier and adhesion promoter in polyurethane2[265] andO UV-curable adhesives [266]. HOOC (CH 2)7 O (CH2)7 O Tung oil O O (CH2)7 O (CH2)7 O (CH2)7 O HOOC Levopimaric acid HQ; 170-260°C; 4-7h O O (CH2)7 HOOC (CH2)7 O O HOOC HOOC Rosin-tung oil adduct conversion: 72% O Diels-Alder Scheme 82. Preparation Levopimaric of idealized adduct. (CH2)7 acid rosin-tung oil HOOC HQ; 170-260°C; 4-7h Tung oil O O O O (CH2)7 HOOC Rosin-tung oil adduct conversion: 72% O Scheme 82. Preparation of idealized (CH rosin-tung oil Diels-Alder 2)7 HOOC adduct. HOOC HOOC Levopimaric acid HQ; 170-260°C; 4-7h Rosin-tung oil adduct conversion: 72% Scheme 82. Preparation of idealized rosin-tung oil Diels-Alder adduct. Scheme 82. Preparation of idealized rosin-tung oil Diels-Alder adduct. Molecules 2019, 24, 1651 Molecules 2019, x FOR PEER REVIEW Molecules 2019, 24,24, x FOR PEER REVIEW 36 of 52 36 36 of of 51 51 Acrylic-vinyl copolymer with rosin moieties is aisslightly yellow solid. It can be prepared from from rosin Acrylic-vinyl copolymer with rosin moieties is a slightly yellow solid. can prepared from Acrylic-vinyl copolymer with rosin moieties a slightly yellow solid. It It can bebe prepared ethyl methacrylate, styrene and divinylbenzene according to Scheme 83, prior to washing, filtration rosin ethyl methacrylate, styrene and divinylbenzene according to Scheme 83, prior to washing, rosin ethyl methacrylate, styrene and divinylbenzene according to Scheme 83, prior to washing, and drying [267]. Its application isapplication polymerismicrospheres for adsorption and separation [267]. filtration and drying [267]. is polymer microspheres adsorption and separation filtration and drying [267]. ItsIts application polymer microspheres forfor adsorption and separation [267]. [267]. PDI=1.30-3.25 PDI=1.30-3.25 O O C C O O O O O O C C O O O O ( ( O O gelatin, toluene, AIBN gelatin, toluene, AIBN in2O H 2O in H 80-90°C, 80-90°C, 5h 5h O O Rosin ethyl methacryalte Rosin ethyl methacryalte ( ( )m()m( )n )n )m()m( )n )n Acrylic-vinylO O Acrylic-vinyl microspheres O O microspheres with rosin moieties with rosin moieties O O C C O O Scheme Preparation acrylic-vinyl copolymer with rosin moieties. Scheme 83.83. Preparation ofof acrylic-vinyl copolymer with rosin moieties. Preparation of acrylic-vinyl copolymer Rosin/lignin grafted copolymers can can becan prepared from lignin and dehydroabietic acid derivatives Rosin/lignin grafted copolymers prepared from lignin anddehydroabietic dehydroabietic acid Rosin/lignin grafted copolymers bebeprepared from lignin and acid in two ways: simple grafting or ATRP polymerization, according to Scheme 84 and using such derivatives two ways: simple grafting ATRP polymerization, according Scheme and using derivatives in in two ways: simple grafting oror ATRP polymerization, according to to Scheme 8484 and using separation methods as precipitation, filtration, washing and vacuum drying [169]. These materials are such separation methods as precipitation, filtration, washing and vacuum drying [169]. These such separation methods as precipitation, filtration, washing and vacuum drying [169]. These characterized by strongly increased hydrophobicity compared to raw lignin [169]. materials characterized strongly increased hydrophobicity compared raw lignin [169]. materials areare characterized byby strongly increased hydrophobicity compared to to raw lignin [169]. X =X2=or2 4or 4 O O = Hor CH Y =YHor CH 3- 3 O O O O O O LIG LIG O O O O COCl COCl 5)3N (C2(C H52)H3N in THF in THF 50°C, 50°C, 12h12h O O O O 2)XO (CH(CH 2)XO O O Br Br ( ( )L )L Y Y OHOH LIGLIGOHOHBr Br OHOH Lignin Lignin O O O O O OLIGLIG O O Br Br 5)3N O O (C2(C H52)H3N O O Br Br in THF in THF O Br O 0°C, 24h Br 0°C, 24h Br Br Lignin ATRP Lignin ATRP macroinitiator macroinitiator HOHO LIG( OH) = LIG( OH) 3 =3 OHOHOHOH O O O O O O HOHO O O O O O O O O O O O ) (CH(CH 2)x 2 x CuBr CuBr in THF in THF 65°C, 65°C, 24h24h O O O O Y Y ( O O O OLIGLIG O O O O O O O Y Y O O )Br Br ( ( )L L O ) (CH O (CH 2)X 2 X O O O O O O O O ( O (CH ) O (CH 2)X 2 X O ) O )L L Br Br Y Y Rosin Rosin polymer grafted from lignin polymer grafted from lignin g/mol MnM =5470-56 400400 g/mol n=5470-56 OHOHOHOH Scheme Preparation lignin materials hydrophobized rosin. Scheme 84.84. Preparation of lignin materials hydrophobized byby rosin. Preparation ofof lignin materials Rosin-caprolactone diblock copolymers canbebeprepared prepared fromdehydroabietic dehydroabietic ethyl diblock copolymers can be prepared from dehydroabietic ethyl methacrylate, Rosin-caprolactone diblock copolymers can from ethyl methacrylate, ε-caprolactone and 2-hydroxyethyl 2-bromoisobutyrate according prior ε-caprolactone and 2-hydroxyethyl 2-bromoisobutyrate according to Scheme 85 prior toScheme precipitation methacrylate, ε-caprolactone and 2-hydroxyethyl 2-bromoisobutyrate according to to Scheme 8585 prior to precipitation and washing [170]. They can be applied in areas designed for simultaneously bioand washing [170]. They can be They applied designed simultaneously bio-based bioand to precipitation and washing [170]. caninbeareas applied in areasfor designed for simultaneously based and biodegradable materials [170]. biodegradable materials [170]. based and biodegradable materials [170]. Acrylpimaric acid hydroxyethyl polyesters light yellow solids. They can prepared Acrylpimaric acid hydroxyethyl polyesters yellow solids. They can bebe Acrylpimaric acid hydroxyethyl polyesters areare light They can be prepared viavia polycondensation of corresponding acrylpimaric diols according to Scheme 86 prior to grinding, polycondensation of of corresponding corresponding acrylpimaric acrylpimaric diols diols according according to to Scheme Scheme 86 86 prior prior to to grinding, grinding, polycondensation washing and drying [138]. Such polymers can potentially applied modern electrical and washing and drying [138]. Such polymers can bebe potentially applied in in thethe modern electrical and electronic industries, especially for the environmentally friendly green products [138]. electronic industries, especially for the environmentally friendly green products [138]. Molecules 2019, 24, 1651 37 of 52 Molecules 2019, 24, x FOR PEER REVIEW 37 of 51 Molecules 2019, x FOR [138]. PEER REVIEW 37 ofand 51 washing and 24, drying Such polymers can be potentially applied in the modern electrical electronic industries, especially for the environmentally friendly green products [138]. Furthermore, rosin can be pyrolized in order to prepare a matrix for silver nanoparticles to apply Furthermore,rosin rosincan canbe bepyrolized pyrolizedin in order order to to prepare aa matrix for silver totoapply Furthermore, for[268], silvernanoparticles apply as antibacterial filler for wooden furniture or air prepare filter for matrix indoors ananoparticles catalyst carrier with as antibacterial filler for wooden furniture or air filter for indoors [268], a catalyst carrier with as antibacterial filler for wooden furniture or air filter for indoors [268], a catalyst carrier with potential potential application as counter electrode for dye-sensitized solar cells [269], a coating for bentonite potential application as counter electrode for dye-sensitized solar cells [269], a coating for bentonite application as counter electrode for dye-sensitizedfor solar cells [269], a coating for bentonite particles and particles chromium ions adsorption [270],and and activated particlesand andsupport support for for Fe Fe22O O33 nanoparticles nanoparticles for chromium ions adsorption [270], activated support for Fe2 O3 nanoparticles for chromium ions adsorption [270], and activated carbons [271,272]. carbons carbons[271,272]. [271,272]. Br Br O O OO OO O O HO HO O O O O Br ( Br ( O O O O )m )m OO CuBr CuBr // tris(2-(dimethyltris(2-(dimethylamino)ethyl)amine amino)ethyl)amine in in toluene toluene O O 120°C, 16h 16h OO OO OO Sn(II)2-ethyl2-ethylSn(II) hexanoate hexanoate OO OO OO Rosin-caprolactone Rosin-caprolactone diblock copolymer copolymer diblock ( ( M Mnn=4700-22 =4700-22 800 g/mol OO )n )n Dehydroabietic Dehydroabietic ethyl ethylmethacrylate methacrylate (DAEMA) (DAEMA) HH Scheme85. 85.Preparation Preparation of rosin-caprolactone diblock Scheme 85. of rosin-caprolactone rosin-caprolactone diblockcopolymer. copolymer. Scheme Preparation diblock copolymer. OO OO Acrylpimaric acid acid Acrylpimaric hydroxyethyl ester ester hydroxyethyl yield:86% 86% yield: OO COO OH OH (C2H5)3N COOH (C2H5)3N COOH 165°C,1.5h 1.5h 165°C, COOH COOH OO OO OO HO HO CC (C2H H)N (C 2 55)33N O O 165°C, 1.5h 165°C, 1.5h Acrylpimaric Acrylpimaric acid acid OH OH OH COO COO cat. cat. vacuum HO vacuum HO <245°C <245°C 10h 10h OH Acrylpimaric COO Acrylpimaric COO acid dihydroxyethyl ester yield: 82% acid dihydroxyethyl ester yield: 82% O C O C (experimental) = 418 MM nn (experimental) = 418 nn OO COO COO COOH COOH Acrylpimaric Acrylpimaricacid acid hydroxyethyl hydroxyethyl polyester polyester yield: HH yield:91% 91% COO COO cat. cat. vacuum vacuum <245°C <245°C 8h 8h O O O O Acrylpimaric Acrylpimaricacid acid dihydroxyethyl dihydroxyethyl polyester H polyester H yield: 70% yield: 70% n (experimental) = 462 n MM n n (experimental) = 462 Scheme86. 86. Preparation Preparation of acrylpimaric acid Scheme acid hydroxyethyl hydroxyethylpolyester. polyester. Scheme 86. Preparation of acrylpimaric acid hydroxyethyl polyester. 4.4.Conclusions Conclusions 4. Conclusions Rosin for both both low lowmolecular molecularweight weightproducts productsand andpolymers. polymers. Rosinisisaahighly highlymodifiable modifiableraw raw material material for Rosin origin is a highly modifiable raw material forand bothalow molecular weightnature, products andispolymers. ItsItsnatural is accompanied with low price diterpene chemical which readytoto natural origin is accompanied with low price and a diterpene chemical nature, which is ready Its natural origin is accompanied with low price and a diterpene chemical nature, which is to introduce reactive chemical groups, and and it exhibits a stiffaconstitution improving many ready thermal, introduceuseful useful reactive chemical groups, it exhibits stiff constitution improving many introduce useful reactive chemical groups, and it exhibits a stiff constitution improving many physical, and functional properties of the final materials. In recent yearsyears rosin-based thermal,mechanical physical, mechanical and functional properties of the final materials. In recent rosinthermal, physical, mechanical and functional properties of the final materials. In recent years rosinchemicals have attracted growing interest. They offer great opportunities to produce useful products: based chemicals have attracted growing interest. They offer great opportunities to produce useful based chemicals have attracted growing interest. They offer great opportunities to produce useful resins, curing agents, surfactants, medicines, medicines, biocides, materials biomedical application, elastomers, products: resins, curing agents, surfactants, biocides,for materials for biomedical application, products: resins, curing agents, surfactants, medicines, coatings, adhesives, sorbents and catalysts.and elastomers, coatings, adhesives, sorbents catalysts.biocides, materials for biomedical application, elastomers, adhesives, the sorbents and properties catalysts. Taking into the declared declared propertiesofofthethe prepared chemicals Takingcoatings, intoconsideration consideration prepared chemicals theythey seemseem to beto Taking into consideration the declared properties of the prepared chemicals they seem be becompetitive competitive alternatives existing products market. review presents well to over alternatives to to existing products on on the the market. This This review presents well over 100 competitive alternatives to existing products on thedo market. This complete review presents wellmakes over 100 reproducible recipes. Sadly, some of of thethe publications not contain data, itit 100 reproducible recipes. Sadly, some publications do not contain complete data,which which makes reproducible recipes. Sadly, some of the publications do not contain complete data, which makes it difficult to repeat the syntheses. According to our subjective opinion, the following information difficult to repeat the syntheses. According to our subjective opinion, the following information should difficult to repeat the syntheses. According to our subjective opinion, the following information be provided (or for obvious) be considered asproduct complete: product name, product beshould provided (or obvious) a recipefor toaberecipe considered as complete: name, product morphology, should be provided (or obvious) forcatalyst, a recipe to becatalyst, considered aspressure, complete: product name, product morphology, substrate(s) names, reaction scheme, media, temperature, pressure, time, yield substrate(s) names, reaction scheme, media, temperature, time, yield and separation morphology, substrate(s) names, reaction scheme, catalyst, media, temperature, pressure, time, yield and separation techniques. Figure 2 shows the number of complete and incomplete recipes in theof techniques. Figure 3 shows the number of complete and incomplete recipes in the individual parts and separation techniques. Figure 2 shows the number of complete and incomplete recipes in individual parts of this review. Interestingly, highest number complete recipes absolute this review. Interestingly, the highest number the of complete recipes of (both absolute and (both relative) canthe be and relative) can among hardeners, andnumber monomers, and also biologically active individual parts of be thisfound review. Interestingly, theresins highest of complete recipes (bothThe absolute found among hardeners, resins and monomers, and also biologically active compounds. most compounds. The common missing is yield. large number ofalso incomplete recipes in and relative) can most be found among hardeners, and monomers, and active common missing parameter is yield. Aparameter large resins number ofA incomplete recipes inbiologically macromolecular macromolecular compounds section may result from the fact that polymerizations are often carried compounds. The most common missing parameter is yield. A large number of incomplete recipes in out in order to achieve appropriate properties, specific yields. The summary presented macromolecular compounds sectionmaterial may result from thenot fact that polymerizations are often carried out in order to achieve appropriate material properties, not specific yields. The summary presented Molecules 2019, 24, 1651 38 of 52 Molecules 2019, 24, x FOR PEER REVIEW 38 of 51 compounds section may result from the fact that polymerizations are often carried out in order to achieve appropriate material properties, notproperties, specific yields. The summary presented Figure 3 out in order to achieve appropriate material not specific yields. The summaryinpresented shows that resins, that monomers, hardeners and biologically active compounds are the mostare completely in Figure 2 shows resins, monomers, hardeners and biologically active compounds the most described rosin-based chemicals in the recent decade, which makes them the most promising subjects completely described rosin-based chemicals in the recent decade, which makes them the most for scaling-up and commercialization. However, this does not change the fact that rosin chemistry is promising subjects for scaling-up and commercialization. However, this does not change the fact that able deliver a serious of new environmentally-friendly solutions in many fields of science, rosintochemistry is able amount to deliver a serious amount of new environmentally-friendly solutions in medicine and engineering. The current review confirms this, and encourages further intensive research many fields of science, medicine and engineering. The current review confirms this, and encourages on rosinintensive in the near future.on rosin in the near future. further research Figure 2. 3. Number Number of of complete complete and and incomplete incomplete recipes recipes presented in this review. review. Funding: This work was financially supported by National Centre for Research and Development (project no. Abbreviations: LIDER/7/0045/L-8/16/NCBR/2017). AA, adipic acid; Conflicts of Interest: The authors declare no dihydrochloride; conflict of interest. AIBA, 2,2′-azobis(2-methylpropionamidine) AIBN, 2,2′-azobisisobutyronitrile; Abbreviations ATRP, atom transfer radical polymerization; BA, butyl acrylate; Bu, butyl AA adipic acid; group; cat., catalyst; 0 DA, dehydroabietic acid; DBU, 1,8-diazabicyclo[5.4.0]undec-7-ene; AIBA 2,2 -azobis(2-methylpropionamidine) dihydrochloride; 0 DCC, N,N′-dicyclohexylcarbodiimide; AIBN 2,2 -azobisisobutyronitrile; DDPD, dehydroabietyl phosphate diester; DMAP, 4-dimethylaminopyridine; ATRP atom transfer radical polymerization; DMF, dimethylformamide; BA butyl acrylate; Bu group; DMSO, dimethylbutyl sulfoxide; Cat. catalyst; EC, ethyl cellulose; DA dehydroabietic EEW, epoxy equivalent weight; acid; DBU Et, ethyl group; 1,8-diazabicyclo[5.4.0]undec-7-ene; DCC N,N0 -dicyclohexylcarbodiimide; HDMA Cl, hexadecyltrimethylammonium chloride; DDPD dehydroabietyl phosphate diester; HDTMAB, hexadecyl trimethyl ammonium bromide; DMAP 4-dimethylaminopyridine; HPI, hydrophilic polyester intermediate; DMF dimethylformamide; HPLC, high-performance liquid chromatography; DMSO dimethyl sulfoxide; HQ, hydroquinone; EC ethyl cellulose; IPA, isophtalic acid; EEW epoxy equivalent weight; JCR, Journal Citation Reports; Et ethyl group; m.p., melting point; Me, methyl group; HDMA Cl hexadecyltrimethylammonium chloride; MEK, methyl ethyl ketone; MPA, maleopimaric acid; HDTMAB hexadecyl trimethyl ammonium bromide; NMP, N-methyl pyrrolidone; HPI hydrophilic polyester intermediate; NMR, nuclear magnetic resonance;liquid chromatography; HPLC high-performance NPG, neopentyl glycol; HQ hydroquinone; PAA, poly(acrylic acid); PEG, poly(ethylene glycol); Ph, phenyl group; PMDETA, pentamethyldiethylenetriamine; Molecules 2019, 24, 1651 IPA JCR m.p. Me MEK MPA NMP NMR NPG PAA PEG Ph PMDETA PPh3 PSA pTSA RAFT ROMP UV TBA Br TEBAC THF TMP TPT TRL 39 of 52 isophtalic acid; Journal Citation Reports; melting point; methyl group; methyl ethyl ketone; maleopimaric acid; N-methyl pyrrolidone; nuclear magnetic resonance; neopentyl glycol; poly(acrylic acid); poly(ethylene glycol); phenyl group; pentamethyldiethylenetriamine; triphenylphosphine; pressure sensitive adhesives; p-toluene sulfonic acid; reversible addition-fragmentation chain-transfer polymerization; ring-opening metathesis polymerization; ultraviolet; tetrabutylammonium bromide; benzyltriethylammonium chloride; tetrahydrofuran; trimethylolpropane; tetraisopropyl titanate; technology readiness level; References 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Silvestre, A.J.D.; Gandini, A. Chapter 4-Rosin: Major sources, properties and applications. 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