Periodic mesoporous organosilica incorporating a catalytically active vanadyl Schiff base complex in the framework

被引：142
作者：
Baleizao, C
Gigante, B
Das, D
Alvaro, M
Garcia, H
Corma, A
机构：
[1] INETI, Dept Tecnol Ind Quim, P-1649038 Lisbon, Portugal
[2] CSIC, Inst Technol Quim, Valencia 46022, Spain
来源：
JOURNAL OF CATALYSIS | 2004年 / 223卷 / 01期
关键词：
asymmetric catalysis; heterogeneous catalysis; periodic mesoporous organosilica; vanadyl salen complexes; cyanohydrins; chiral MCM-41;
D O I：
10.1016/j.jcat.2004.01.016
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A vanadyl Schiff base complex having two terminal trimethoxysilyl groups peripheral to the ligand has been used to obtain a MCM-41-like mesoporous organosilicate that has been found to catalyze efficiently the cyanosilylation of carbonyl groups. Evidence for the successful preparation of the periodic mesoporous organosilica is based on powder XRD (high periodicity), isothermal Ar adsorption (900 m(2)/g), mono-modal pore-size distribution (42 Angstrom), diffuse reflectance UV-visible spectroscopy (characteristic absorption band of vanadyl salen complex), and Si-29 NMR (presence of T-3 silicon atoms, CH2-Si(OSidrop)(3)). In addition, we have been able to prepare a chiral vanadyl salen complex that is able to catalyze the carbonyl addition with 30% ee. (C) 2004 Elsevier Inc. All rights reserved.
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页码：106 / 113
页数：8
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