Retracted Article: Synthesis of a novel type of chiral salen Mn(iii) complex immobilized on crystalline zinc poly(styrene-phenylvinylphosphonate)-phosphate (ZnPS-PVPP) as effective catalysts for asymmetric epoxidation of unfunctionalized olefins

Abstract

A novel type of organic polymer–inorganic hybrid material layered crystalline ZnPS-PVPP was designed and prepared. Notably, the layered crystalline ZnPS-PVPP were obtained in the absence of any templated agents. An array of new heterogeneous catalysts were gained by grafting chiral salen Mn(III) onto aryldiamine modified ZnPS-PVPP. The immobilized catalysts exhibited higher chiral induction in the asymmetric epoxidation of α-methylstyrene and indene with m-CPBA and NaIO₄ as oxidants than those of the corresponding homogeneous catalyst (ee, >99% vs. 54% and >99% vs. 65%) and could be reused nine times without significant loss of activity and enantioselectivity. Furthermore, this novel type of catalyst can also be efficiently used in large-scale reactions with the enantioselectivity being maintained at the same level, which provided the potentiality for application in industry.