有机-无机杂化载体-聚(苯乙烯-苯乙烯基膦酸)-磷酸氢锆-在烯烃环氧化反应中的应用

摘要

The chiral Mn(Ⅲ) salen catalyst axially immobilized onto an organic-inorganic hybrid support-phenoxy modified zirconium poly (styrene-phenylvinylphosphonate)-phosphate (ZPS-PVPA) can afford dramatically increased conversion and ee (Enantiomeric excess) value in the absence of expensive O-coordinating axial bases for the asymmetric epoxidation.Especially for the epoxidation of α-methylstyrene in the m-chloroperbenzoic acid (m-CPBA) oxidant system (cony.％:from 25.0％ to 98.8％; ee％:from 5.3％ to 67.3％).Moreover,the assynthesized catalyst is relatively stable and can be recycled at least five times without significant loss of activity and enantioselectivity.%有机聚合物-无机杂化载体-聚(苯乙烯-苯乙烯基膦酸)-磷酸氢锆-轴向固载手性Salen Mn(Ⅲ)催化剂,将其应用于非官能烯烃的多相不对称环氧化反应.结果表明:在没有昂贵轴向添加剂参与下,产率与对映选择性均急剧增加.以间氯过氧苯甲酸(m-CPBA)氧化剂催化氧化α-methylstyrene,转化率从25.0％上升到98.8％;对映选择性从5.3％提高到67.3％.催化剂在循环使用5次以后,催化活性无明显改变.