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题名: Enantioselective epoxidation of beta-methylstyrene catalyzed by immobilized Mn(salen) catalysts in different mesoporous silica supports
作者: Zhang, Haidong2;  Wang, Yi Meng1;  Zhang, Lei2;  Gerritsen, Gijsbert1;  Abbenhuis, Hendrikus C. L.1;  van Santen, Rutger A.1;  Li, Can2
关键词: chiral catalysis ;  Mn(salen) ;  asymmetric epoxidation ;  motion restriction ;  confinement effect ;  mesoporous ;  immobilization
刊名: JOURNAL OF CATALYSIS
发表日期: 2008-06-10
DOI: 10.1016/j.jcat.2008.03.013
卷: 256, 期:2, 页:226-236
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Mesoporous silica-supported chiral Mn(salen) catalysts were prepared and evaluated in the heterogeneous asymmetric epoxidation of 15-methylstyrene with NaClO as an oxidant. Homogeneous and immobilized Mn(salen) catalysts exhibit similar cis/trans ratios and ee values when trans-substrate is used but different cis/trans ratios and ee values when cis-substrate is used. The production of trans-epoxides is favored in the heterogeneous asymmetric epoxidation of cis-beta-methylstyrene, whereas the production of cis-epoxides is favored in homogeneous reaction. In addition, the cis/trans ratio and ee value of transepoxides produced from cis-beta-methylstyrene change sequentially with changes in support materials, but the ee value of cis-epoxides does not. The textural properties of immobilized Mn(salen) catalysts can be sequentially adjusted by changing pore dimension and channel length, after which the motion restriction and confinement effect in nanochannels of immobilized Mn(salen) catalysts can be adjusted sequentially. Our results reflect that the collapse step of trans-intermediates is considerably affected by the confinement effect. whereas the rotation step of cis-intermediates is greatly influenced by motion restriction. The motion restriction in nanochannels increases the likelihood of rotation for the C-C single bond of cis-intermediates and favors the production of trans-epoxides. (c) 2008 Published by Elsevier Inc.
关键词[WOS]: MN-SALEN COMPLEXES ;  ASYMMETRIC EPOXIDATION ;  UNFUNCTIONALIZED OLEFINS ;  (SALEN)MANGANESE COMPLEXES ;  HETEROGENEOUS CATALYSIS ;  POROUS MATERIALS ;  ALKENES ;  STYRENE ;  SBA-15 ;  NANOPORES
语种: 英语
WOS记录号: WOS:000256842100007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140904
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Eindhoven Univ Technol, Schuit Inst Catalysis, NL-5600 MB Eindhoven, Netherlands
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Zhang, Haidong,Wang, Yi Meng,Zhang, Lei,et al. Enantioselective epoxidation of beta-methylstyrene catalyzed by immobilized Mn(salen) catalysts in different mesoporous silica supports[J]. JOURNAL OF CATALYSIS,2008,256(2):226-236.
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