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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)
KeywordHeterogeneous Catalysis Enantioselective Epoxidation Mesoporous Material Unfunctional Olefin Mn(Salen) Complexes
Source PublicationJOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
2005-09-01
DOI10.1016/j.molcata.2005.05.024
Volume238Issue:1-2Pages:175-184
Indexed BySCI
SubtypeArticle
Department5
Funding Project503
Contribution Rank1;1
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
WOS KeywordMANGANESE(III) SALEN COMPLEXES ; ASYMMETRIC EPOXIDATION ; STEREOSELECTIVE EPOXIDATION ; UNFUNCTIONALIZED OLEFINS ; MN(III)-SALEN COMPLEX ; HYDROGEN-PEROXIDE ; ACTIVATED CARBON ; SILICA-GEL ; MCM-41 ; IMMOBILIZATION
AbstractThree 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.
Language英语
URL查看原文
WOS IDWOS:000231018800024
Citation statistics
Cited Times:82[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/93033
Collection中国科学院大连化学物理研究所
Corresponding AuthorLi C(李灿); Li C(李灿)
Affiliation1.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
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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