Vanadium-Schiff base complex covalently bonded on modified MCM-41 as catalyst for asymmetric oxidation of methyl phenyl sulfide
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- 作者：T. Ben Zid ; I. Khedher ; Z. Ksibi ; J. M. Fraile
- 关键词：Vanadium ; Schiff base complex ; Asymmetric oxidation of sulfides ; Heterogeneous catalysis ; Mesoporous silica as support
- 刊名：Journal of Porous Materials
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：23
- 期：2
- 页码：507-516
- 全文大小：1,319 KB
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I. Khedher (1)
Z. Ksibi (1)
J. M. Fraile (2)
1. Laboratoire de Chimie des Matériaux et Catalyse, Département de Chimie, Faculté des Sciences de Tunis, 1060, Tunis, Tunisia
2. Instituto de Síntesis Química y Catálisis Homogénea, Facultad de Ciencias, C.S.I.C.-Universidad de Zaragoza, 50009, Saragossa, Spain - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Catalysis
Characterization and Evaluation Materials
Physical Chemistry - 出版者：Springer Netherlands
- ISSN：1573-4854
文摘
The vanadium-Schiff base complex was immobilized on mesoporous MCM-41 by a covalent grafting method using 3-aminopropyltriethoxysilane as a reactive surface modifier. The formation and integrity of the complex have been studied using XRD, FT-IR, UV–Vis, ESR, 29Si-MAS-NMR and N2 adsorption–desorption. The heterogeneous VO(Schiff)-MCM catalyst shows an activity and an enantioselectivity comparable to those obtained with the homogeneous catalyst VO(Schiff), for the asymmetric oxidation of methyl phenyl sulfide. The combination of the heterogenous catalyst with CHP as oxidant offers a selective catalytic system for oxidation of methyl phenyl sulfide with a significant enantioselectivity in the range of 17–23 % ee. In addition, the heterogeneized catalyst could be easily separated from the products and reused.