Enantioselective epoxidation of unfunctionalized olefins catalyzed by the Mn(salen) catalysts immobilized in the nanopores of mesoporous materials

	Enantioselective epoxidation of unfunctionalized olefins catalyzed by the Mn(salen) catalysts immobilized in the nanopores of mesoporous materials
	Zhang, HD; Zhang, YM; Li, C
刊名	journal of catalysis
	2006-03-10
卷号	238 期号:2 页码:369-381
关键词	heterogeneous catalysis chiral catalysis enantioselective asymmetric catalysis epoxidation sulfonic immobilization grafting unfunctionalized olefin Mn(salen) complexes confinement effect
通讯作者	李灿
产权排序	1;1
英文摘要	three mn(salen) catalysts were immobilized in nanopores or on external surface of mesoporous materials via phenyl sulfonic groups with different linkage lengths. the influence of the axial linkage length and the nanopores or external surface of supports on the catalytic performance of the heterogeneous mn(salen) catalysts was investigated in detail. the ee values increase with increasing linkage length for the mn(salen) catalysts immobilized in nanopores but remain almost unchanged for those catalysts anchored on the external surface. the ee values obtained for the mn(salen) catalysts immobilized in nanopore increase with decreasing nanopore size and they are generally higher than those of the same catalysts anchored on the external surface of support. modification of the nanopore surface by methyl groups improves the reaction performance for the asymmetric epoxidation. the confinement effect originating from nanopores not only enhances the chiral recognition of the chiral catalyst, but also restricts the rotation of the intermediate in nanopores, enhancing the asymmetric induction and giving higher ee values than those obtained for the same catalysts anchored oil the external surface. (c) 2006 elsevier inc. all rights reserved.
WOS标题词	science & technology ; physical sciences ; technology
类目[WOS]	chemistry, physical ; engineering, chemical
研究领域[WOS]	chemistry ; engineering
关键词[WOS]	chiral salen complexes ; schiff-base complex ; asymmetric epoxidation ; stereoselective epoxidation ; nonfunctionalized alkenes ; mn(iii)-salen complex ; mcm-41 ; styrene ; donor ; clay
收录类别	SCI
原文出处	true
语种	英语
WOS记录号	WOS:000235625100015
公开日期	2010-11-30
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/98233]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Zhang, HD,Zhang, YM,Li, C. Enantioselective epoxidation of unfunctionalized olefins catalyzed by the Mn(salen) catalysts immobilized in the nanopores of mesoporous materials[J]. journal of catalysis,2006,238(2):369-381.
APA	Zhang, HD,Zhang, YM,&Li, C.(2006).Enantioselective epoxidation of unfunctionalized olefins catalyzed by the Mn(salen) catalysts immobilized in the nanopores of mesoporous materials.journal of catalysis,238(2),369-381.
MLA	Zhang, HD,et al."Enantioselective epoxidation of unfunctionalized olefins catalyzed by the Mn(salen) catalysts immobilized in the nanopores of mesoporous materials".journal of catalysis 238.2(2006):369-381.