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Indexed by:期刊论文
Date of Publication:2008-10-01
Journal:APPLIED ORGANOMETALLIC CHEMISTRY
Included Journals:SCIE、EI、Scopus
Volume:22
Issue:10
Page Number:592-597
ISSN No.:0268-2605
Key Words:pyrrolidine SalenMn(III) complexes; asymmetric epoxidation; chromene; enantioselectivity
Abstract:Chiral pyrrolidine SalenMn(III) complexes with an anchored functional group at the N-aza-substituent in the pyrrolidine backbone were synthesized, and used as catalysts for asymmetric epoxidation of substituted chromenes. The complex 1 with an anchored imidazole as acceptor could effectively catalyze epoxidation of substituted chromenes in the absence of expensive additive 4-phenyl pyridine N-oxide (PPNO) by the coordination of the anchored organic base to the central manganese ion. Complexes 2 and 3 with a quaternary ammonium salt unit at the Naza-substituent in the pyrrolidine backbone displayed higher activities than Jacobsen catalyst and the analogous complex 4 without anchored functional group in the aforementioned reaction. Copyright (C) 2008 John Wiley & Sons, Ltd.
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