键联聚乙二醇高分子担载锰（Ⅲ）卟啉的合成及催化烯烃环氧化反应性能研究

Synthesis and Catalytic Performance of Polymer-Supported Metalloporphyrins Bearing Polyglycol Chains

本文研究了键联聚乙二醇高分子担载锰（Ⅲ）卟啉的合成，以及在ＣＨ_２Ｃｌ_２／Ｈ_２Ｏ两相体系中催化苯乙烯环氧化反应的性能．探索了催化反应体系中溶液ｐＨ值、ＮａＯＣｌ浓度、轴向配体及相转移催化剂对催化反应的影响．结果说明键联聚乙二醇高分子担载锰（Ⅲ）卟啉是烯烃环氧化反应的一种有效催化剂，其中聚乙二醇链可以络合Ｎａ，使ＯＣｌ富集于金属卟啉周围，起到较好的相转移催化作用．在催化反应的各影响因素中，水相ｐＨ值对反应的影响最大．

Synthesis and catalytic performance of polymer-supported metalloporphyrins bearing polyglycol chains in CH_2Cl_2/H_2O two-phase system were studied. The influence of pH values,concentration of NaOCl , axial ligands and phase transfer catalysts on the epoxidation of styrene catalyzed by those catalysts have also been investigated.The experimental results show that manganese (Ⅲ) porphyrins bound to chloromethylated polystyrene which bears some polyglycol chains are efficient catalysts for the epoxidation of styrene by sodium hypochlorite. The introduction of polyglycol chain increases the amount of oxidant in the organic phase by extracting from the aqueous phase.Under these conditions,the anion associated with the polyglycol chain is extremely reactive as an oxidant.In all factors studied experimentally,the influence of pH values in aqueous solution is the greatest.