Heterogeneous enantioselective epoxidation catalyzed by Mn(salen) complexes grafted onto mesoporous materials by phenoxy group

	Heterogeneous enantioselective epoxidation catalyzed by Mn(salen) complexes grafted onto mesoporous materials by phenoxy group
	Zhang, HD ; Xiang, S ; Xiao, JL ; Li, C
刊名	journal of molecular catalysis a-chemical
	2005-09-01
卷号	238 期号:1-2 页码:175-184
关键词	heterogeneous catalysis enantioselective epoxidation mesoporous material unfunctional olefin Mn(salen) complexes
通讯作者	李灿
产权排序	1;1
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.
WOS标题词	science & technology ; physical sciences
类目[WOS]	chemistry, physical
研究领域[WOS]	chemistry
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
收录类别	SCI
原文出处	true
语种	英语
WOS记录号	WOS:000231018800024
公开日期	2010-11-30
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/93033]
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	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
推荐引用方式 GB/T 7714	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.
APA	Zhang, HD,Xiang, S,Xiao, JL,&Li, C.(2005).Heterogeneous enantioselective epoxidation catalyzed by Mn(salen) complexes grafted onto mesoporous materials by phenoxy group.journal of molecular catalysis a-chemical,238(1-2),175-184.
MLA	Zhang, HD,et al."Heterogeneous enantioselective epoxidation catalyzed by Mn(salen) complexes grafted onto mesoporous materials by phenoxy group".journal of molecular catalysis a-chemical 238.1-2(2005):175-184.