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Asymmetric epoxidation of 6-cyano-2,2-dimethylchromene on Mn(salen) catalyst immobilized in mesoporous materials
Zhang, H; Li, C
关键词Heterogeneous Chiral Catalysis Asymmetric Epoxidation Mn(Salen) Confinement Effect Nanopore Enantioselective
刊名TETRAHEDRON
2006-07-12
DOI10.1016/j.tet.2006.01.117
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
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
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.
语种英语
WOS记录号WOS:000238643500006
引用统计
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/139972
专题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
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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.
APA Zhang, H,&Li, C.(2006).Asymmetric epoxidation of 6-cyano-2,2-dimethylchromene on Mn(salen) catalyst immobilized in mesoporous materials.TETRAHEDRON,62(28),6640-6649.
MLA Zhang, H,et al."Asymmetric epoxidation of 6-cyano-2,2-dimethylchromene on Mn(salen) catalyst immobilized in mesoporous materials".TETRAHEDRON 62.28(2006):6640-6649.
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