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题名: Heterogeneous enantioselective epoxidation catalyzed by Mn(salen) complexes grafted onto mesoporous materials by phenoxy group
作者: Zhang, HD;  Xiang, S;  Xiao, JL;  Li, C
通讯作者: 李灿
关键词: heterogeneous catalysis ;  enantioselective epoxidation ;  mesoporous material ;  unfunctional olefin ;  Mn(salen) complexes
刊名: JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
发表日期: 2005-09-01
DOI: 10.1016/j.molcata.2005.05.024
卷: 238, 期:1-2, 页:175-184
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 503
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Three chiral Mn(salen) complexes were immobilized into different mesoporous material via phenoxy group by a simplified method and they show high activity and enantioselectivity for asymmetric epoxidation of various substituted unfunctional olefins. The heterogeneous Mn(salen) catalysts show comparable ee values for asymmetric epoxidation of styrene and 6-cyano-2,2-dimethylchromene and much higher ee values for epoxidation of a-methylstyrene (heterogeneous 79.7% ee versus homogeneous 26.4% ee) and cis-beta-methylstyrene (heterogeneous 94.9% ee versus homogeneous 25.3% ee for cis-epoxide) than the homogeneous catalysts. These heterogeneous catalysts also remarkably alter the cis/trans ratio of epoxides for asymmetric epoxidation of cis-beta-methylstyrene (heterogeneous 21 versus homogeneous 0.38). The axial tether group does not make a big effect on ee values and the increase in ee value and change in cis/trans ratio are mainly attributed to the axial immobilization mode and the support effect of heterogeneous catalysts. The catalysts keep constant ee values for the recycle tests of eight times for asymmetric epoxidation of a-methylstyrene. And several possibilities were proposed to elucidate the difference in ee values of heterogeneous catalysts from homogeneous catalysts. (c) 2005 Elsevier B.V. All rights reserved.
关键词[WOS]: MANGANESE(III) SALEN COMPLEXES ;  ASYMMETRIC EPOXIDATION ;  STEREOSELECTIVE EPOXIDATION ;  UNFUNCTIONALIZED OLEFINS ;  MN(III)-SALEN COMPLEX ;  HYDROGEN-PEROXIDE ;  ACTIVATED CARBON ;  SILICA-GEL ;  MCM-41 ;  IMMOBILIZATION
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000231018800024
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/93033
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.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Univ Liverpool, Dept Chem, Leverhulme Ctr Innovat Catalysis, Liverpool L69 7ZD, Merseyside, England

Recommended Citation:
Zhang, HD,Xiang, S,Xiao, JL,et al. Heterogeneous enantioselective epoxidation catalyzed by Mn(salen) complexes grafted onto mesoporous materials by phenoxy group[J]. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,2005,238(1-2):175-184.
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