Name…………………… Student Number………………… CH450 CHEMICAL WRITING AND PRESENTATION MID TERM EXAMINATION WEDNESDAY 30 MARCH 2011 Time allowed: 60 minutes 1. Write improved titles for the following. Convert assertive sentence type titles to descriptive (label) titles and avoid hanging titles. (10 points) (a) A comparative study of extraction methods for the volatile compounds in Muscat grape juice Comparison of extraction methods for volatile compounds in Muscat grape juice (b) Acetohydroxamatoiron (III) complexes: thermodynamics of formation and temperature-dependent speciation Thermodynamics of formation and temperature-dependent speciation of acetohydroxamatoiron (III) complexes (c) Studies on the reaction kinetics and mechanism of iron (II) reduction of cishalogeno(cetylamine)bis(ethylenediamine)cobalt (III) complex in aqueous perchloric acid Reaction kinetics and mechanism of iron (II) reduction of cishalogeno(cetylamine)bis(ethylenediamine)cobalt (III) complex in aqueous perchloric acid (d) Small Yttrium-doped gold clusters show fluxionality and -aromaticity Fluxionality and -aromaticity of small Yttrium-doped gold clusters (e) Sulfides are easily oxidized to sulfoxides by iodosobenzene and benzeneseleninic acid as a catalyst Easy oxidation of sulfides to sulfoxides by iodosobenzene and benzeneseleninic acid as catalyst 1 2. Rewrite the “Abstract” below, according to recommendations discussed in class. Word limit: 50. Write a graphical abstract to match this abstract (10 points) Reduction of carbonyl compounds with metal hydride is one of the most basic transformations in organic synthesis. Recently, efforts have been devoted to utilize inexpensive, stable, environmentally benign metal hydrides as a reductive hydride source4. We effectively reduce ketones and aldehydes to the silyl ethers of the corresponding alcohol in high yields (see Table 1) by the reaction of calcium hydride and trialkylsilyl chloride (R3SiCl) in the presence of a catalytic amount of zinc chloride (Scheme 1). The reaction is general, efficient, has high functional group compatibility and the reagents are inexpensive, stable and environmentally friendly. (96 words) Ketones and aldehydes were effectively reduced to the silyl ethers of the corresponding alcohol in high yields by the reaction of calcium hydride and trialkylsilyl chloride (R3SiCl) in the presence of a catalytic amount of zinc chloride. The reaction is general, efficient, has high functional group compatibility and the reagents are inexpensive, stable and environmentally friendly. Graphical abstract CaH2, R3SiCl, ZnCl 2 O R1 R2 Conditions OSiR 3 R1 R2 2 3. Change the following references (a)-(c) to the style shown in the box below. (10 points) 23 A. P. de Silva, D. B. Fox, A. J. M. Huxley and T. S. Moody, Coord. Chem. Rev., 2000, 205, 41. 3 Cyanide in Biology, ed. B. Vennesland, E. F. Comm, J. Knownles, J. Westly and F. Wissing, Academic, London, 1981. 5 G. D. Muir, Hazards in the Chemical Laboratory, The Royal Society of Chemistry, London, 1977. (a) 11. Bau, J. and P.M. Weber (2011). Electronic effects on photochemistry: the diverse reaction dynamics of highly excited stilbenes and azobenzene. J Am Chem Soc: 133, 4153-4660 11 J. Bau and P. M. Weber, J. Am. Chem. Soc., 2011, 133, 4153. (b) 20. Kankia, B. L.; Marky, L. A. A. J. Am. Chem. Soc. 2001, 123, 10799-10804. . 20 B. Kankia and L. A. A. Marky, J. Am. Chem. Soc., 2001, 123, 10799. (c) 14. Carbon Nanotubes; Endo, M.; Iijima, S.; Dresselhaus, M. S., Eds.; Elsevier: Oxford, 1996. 14 Carbon Nanotubes, ed. M. Endo, S. Iijima and M. S. Dresselhaus, Elsevier, Oxford, 1996. 3