‫شر ال ع لميمرك ز ال ن‬
Center of Scientific Publications













MainPage
About the center
Journal of KAU
Electronic books
Saudi Systems
Search for Publications
Parallel Publication
Researches
Files
New Publications
Publications
o Scientific books
 Islamic
economy
 Economy and
administration
 Literature
 Reviews
 Geography
 Computer
Science
 Fire
 Religion
 Mathematics
and Statistics
 Geology
 Piology
 Educational
Science
o Seminars and
Conferences
o Training Courses
o Official Printing on
Paper
o Abstracts and indexes
Under publishing
Request
o Request Order
o Subscription
‫جامعة ال م لك ع بدال عزي ز‬
King Abdulaziz University
Document Details
Document Type
Document Title
: Article In Conference
: Solvent-free oxidation of alcohols by hydrogen
peroxide over chromium Schiff base complexes
immobilized on MCM-41: optimization of
catalytic activity by modificating the local
environment of active complexes
Solvent-free oxidation of alcohols by hydrogen
peroxide over chromium Schiff base complexes
immobilized on MCM-41: optimization of
catalytic activity by modificating the local
environment of active complexes
Subject
Document
Language
Abstract
: ‫ءك يم يا‬
: English
: Oxidation of alcohols to aldehydes and ketones
is a ubiquitous transformation in organic
synthesis. Recent demand for eco-friendly
chemical processes encouraged the
development of clean reactions. Hydrogen
peroxide as an oxidant are atom efficient and
produce water as the only by-product [1]. On
the other hand, solvent-free reactions are of
general interest due to their potential in
combinational chemistry, simple processes,
easy work-up, low cost and reduction in
noxious waste materials. however, only a
limited number of such useful oxidation
procedures have been reported. Development of
efficient biomimetic heterogeneous oxidation
catalysts containing metal complexes,
especially the heterogenised transition metal
Schiff base complexes is eye-catching for their
more accessible synthesis conditions and
versatile coordination structures [2]. In the
present work, a conventional chromium Schiff

Contact Us
Visits Of this Page
0
Conference Name
Duration
Publishing Year
base complex was successfully immobilized
MCM-41. In order to optimize the catalytic
performance of immobilized complexes, a
series of typical methyl regulators were further
used to finely modify the local environment of
active sites in immobilized complex. By
changing the kinds and amounts of methyl
regulators and their relative position to active
sites, a series of methyl-containing immobilized
chromium complexes were prepared and used
for the selective oxidation of alcohols with 30%
H2O2. Elemental analysis and 13C CP/MAS
NMR, FTIR and UV spectra showed that the
homogeneous chromium complexes had been
immobilized on MCM-41, and that the methyl
regulators were also successfully introduced.
The powder XRD patterns and N2 sorption
isotherms displayed that all immobilized
complexes still exhibited typical ordered hybrid
mesophases. Furthermore, with the introduction
of methyl regulators, the surface polarity of
immobilized complexes decreased while their
hydrophobicity increased. This indicated that
the local environment of active sites in
immobilized complexes changed significantly.
The immobilized complexes were effective
catalysts and all exhibited much higher
catalytic performance than their corresponding
homogeneous analogues. Simultaneously, the
catalytic performance of immobilized
complexes was closely related to the kinds,
amounts and relative localities to active
complexes of methyl regulators. Under the
optimal reaction conditions, aliphatic secondary
alcohols, cyclic alcohols and benzylic alcohols
were all oxidized in good yields, and the major
products were their corresponding ketones or
aldehydes, while primary alcohols were mainly
oxidized to carboxylic acid.
: Tenth International Symposium on
Heterogeneous Catalysis
: From : 22/8/1429 AH - To : 26/8/1429 AH
From : 23/8/2008 AD - To : 27/8/2008 AD
: 1429 AH
2008 AD
Article Type
Added Date
: Article
: Sunday, February 22, 2009
Researchers
Researcher Name Researcher Name Researcher
Dr
Email
(Arabic)
(English)
Type
Grade
Xiaoli Wang
Xiaoli Wang
Researcher Doctorate
Gongde Wu
Gongde Wu
Researcher Doctorate
Junping Li
Junping Li
Researcher Doctorate
Fukui Xiao
Fukui Xiao
Researcher Doctorate
Wei Wei
Wei Wei
Researcher Doctorate
Yuhan Sun
Yuhan Sun
Researcher Doctorate
Files
File Name
18552.pdf
Type
pdf
Deanship of Information Technology - King Abdulaziz University. All rights reserved
Description