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Heterogeneous enantioselective epoxidation catalyzed by Mn(salen) complexes grafted onto mesoporous materials by phenoxy group
Zhang, HD; Xiang, S; Xiao, JL; Li, C; Li C(李灿); Li C(李灿)
关键词Heterogeneous Catalysis Enantioselective Epoxidation Mesoporous Material Unfunctional Olefin Mn(Salen) Complexes
刊名JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
2005-09-01
DOI10.1016/j.molcata.2005.05.024
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
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
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.
语种英语
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WOS记录号WOS:000231018800024
引用统计
被引频次:80[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/93033
专题中国科学院大连化学物理研究所
通讯作者Li C(李灿); Li C(李灿)
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
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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,李灿,&李灿.(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.
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