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Synfacts 2005(2): 0270-0270  
DOI: 10.1055/s-2005-916095
Polymer-Supported Synthesis
© Georg Thieme Verlag Stuttgart · New York

Asymmetric Epoxidation Catalyzed by Axially Immobilized Mn(salen) Complexes

Contributor(s): Yasuhiro Uozumi, Yasunari Maeda
H. Zhang, Y. Zhang, C. Li*
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, P. R. of China
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Publikationsverlauf

Publikationsdatum:
25. Oktober 2005 (online)

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Significance

Chiral Mn(salen) complexes were axially immobilized onto rigid polystyrene resin. The polymer-immobilized Mn(salen) catalysts 2 and 4 gave comparable or even higher ee values than their homogeneous counterparts for the asymmetric epoxidation of unfunctional olefins [for example, 55.0% ee vs. 74.0% ee (eq. 1) and 26.4% vs. 76.9% ee (eq. 2)]. The heterogeneous Mn(salen) catalysts were readily recycled and reused.