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题名: Asymmetric epoxidation of 6-cyano-2,2-dimethylchromene on Mn(salen) catalyst immobilized in mesoporous materials
作者: Zhang, H;  Li, C
关键词: heterogeneous chiral catalysis ;  asymmetric epoxidation ;  Mn(salen) ;  confinement effect ;  nanopore ;  enantioselective
刊名: TETRAHEDRON
发表日期: 2006-07-12
DOI: 10.1016/j.tet.2006.01.117
卷: 62, 期:28, 页:6640-6649
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Organic
研究领域[WOS]: Chemistry
英文摘要: This article reports our recent work on the heterogeneous asymmetric epoxidation catalyzed by chiral Mn(salen) catalyst axially immobilized via phenoxyl groups and organic sulfonic groups. The asymmetric epoxidation of 6-cyano-2,2-dimethylchromene was especially presented in detail. The factors that affected the asymmetric induction, such as the nanopores and the external surface, the linkage length, and the modification of nanopores with methyl groups were discussed. It was found that the enantioselectivities increased with decreasing the nanopore sizes or increasing the linkage length in nanopore, and the Mn(salen) catalyst immobilized into nanopores generally gave higher ee values than those on the external surface. The heterogeneous Mn(salen) catalysts with modified nanopores gave a TOF of 14.8 h(-1) and an ee value of 90.6% for the asymmetric epoxidation of 6-eyano-2,2-dimethylchromene, which were higher than the results (TOF 10.8 h(-1), ee 80.1%) obtained for the homogeneous catalyst. (c) 2006 Elsevier Ltd. All rights reserved.
关键词[WOS]: HETEROGENEOUS ENANTIOSELECTIVE CATALYST ;  SCHIFF-BASE COMPLEX ;  SALEN COMPLEXES ;  UNFUNCTIONALIZED OLEFINS ;  NONFUNCTIONALIZED ALKENES ;  HYDROGEN-PEROXIDE ;  CHIRAL CATALYSTS ;  POROUS MATERIALS ;  ZEOLITE-Y ;  MCM-41
语种: 英语
WOS记录号: WOS:000238643500006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139972
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

Recommended Citation:
Zhang, H,Li, C. Asymmetric epoxidation of 6-cyano-2,2-dimethylchromene on Mn(salen) catalyst immobilized in mesoporous materials[J]. TETRAHEDRON,2006,62(28):6640-6649.
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