Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 352, Issue 1, Pages 163-170Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.200900424
Keywords
asymmetric epoxidation of unfunctionalized olefins; axially coordinated immobilization; chiral Jacobsen's catalyst; phenoxy-modified support; zirconium poly(styrene-phenylvinylphosphonate)phosphate
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Funding
- Committee for Economics of Chongqing Municipality [2008-65]
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Chiral Jacobsen's catalyst was axially Immobilized onto phenoxy-modified zirconium poly(styrene-phenylvinylphosphonate)phosphate (ZPS-PVPA). The immobilized catalysts show comparable ee values for asymmetric epoxidation of styrene and much higher ee values for alpha-methylstyrene (73.7% vs. 54.0%) and indene (99.9% vs. 65.0%) than the homogeneous Jacobsen's catalyst. Moreover, the assynthesized catalysts are relatively stable and can be recycled at least five times without significant loss of activity and enantioselectivity. A point worth emphasizing is that the heterogeneous catalysts afforded remarkable increases of conversion and ee values in the absence of expensive O-coordinating axial bases for the asymmetric epoxidation of olefins, especially for the epoxidation of alpha-methylstyrene (conversion: from 24.3% to 99.9%, ee: from 29.4% to 73.7%), which may overcome the last obstacle for the potential industry application of chiral Jacobsen's catalyst.
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