期刊
JOURNAL OF CATALYSIS
卷 262, 期 1, 页码 9-17出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2008.11.027
关键词
Zirconium poly(styrene-phenylvinylphosphonate)-phosphate; Chiral salen Mn(III); Heterogeneous catalysts; Unfunctionalized olefins; Enantioselective epoxidation
资金
- Southwest University of China
A new type of inorganic-organic hybrid materials-zirconium poly(styrene-phenylvinylphosphonate)phosphate (ZPS-PVPA) was designed and synthesized. A series of new heterogeneous catalysts was obtained by grafting diamine or polyamine on ZPS-PVPA and subsequently axial coordination with chiral salen Mn(III) complexes, All the synthesized heterogeneous catalysts exhibited great activity and enantioselectivity in the asymmetric epoxidation of unfunctionalized olefins. Especially, in the epoxidation of alpha-methylstyrene, both the conversion and enantiometric excess (ee) could exceed 99%. Furthermore, the catalysts were conveniently separated from the reaction system by simple precipitation in hexane and could be reused at least ten times without significant loss of activity and enantioselectivity. Crown Copyright (C) 2008 Published by Elsevier Inc. All rights reserved.
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