Salen Mn(III) immobilized onto ZnPS-PVPA modified by 1,2,3-triazole as efficient and reusable catalysts for asymmetric epoxidation of olefins

A series of novel types of chiral salen Mn(III) anchored onto ZnPS-PVPA containing 1,2,3-triazole were synthesized by means of click chemistry. These supported catalysts were highly active and enantioselective (conversion up to 99%; ee up to 99%) in the asymmetric epoxidation of unfunctionalized olefins and were selective for the oxidants. Moreover, these heterogeneous catalysts could still show good catalytic ability after recycling nine times. Furthermore, the catalyst could also maintain its superior catalytic properties in large-scale reactions, which demonstrate their potential for application in industry.