Chiral salen Mn(III) immobilized on sulfoalkyl modified ZSP-IPPA as an effective catalyst for asymmetric epoxidation of unfunctionalized olefins

Sulfoalkyl modified zirconium poly (styrene-isopropenyl phosphonate)-phosphate (ZPS-IPPA), with special structures of new type of organic-inorganic hybrid material were designed and synthesized for immobilization of the chiral salen Mn(III) Jacobsen's homogenous catalyst by axial coordination All the heterogeneous chiral salen Mn(III) catalysts with different linkage lengths obtained exhibited great catalytic activity and enantioselectivity in the asymmetric epoxidation of unfunctionalized olefins The Influence of the linkage lengths on the catalytic performance was investigated What's more, the catalysts were easily separated from the reaction systems and could be reused for several times without significant loss of catalytic activity. (C) 2010 Elsevier B V All rights reserved