二氧化硅负载丙氧甲基苯并冠醚的合成与性能

烯丙氧甲基多缩乙二醇与１，２－双（羟乙氧基）苯双对甲苯磺酸酯在氢化钠存在下关环缩合，得到９－烯丙氧甲基－２，３－苯并１８－冠－６与１５－冠－５．二者分别依次以三乙氧基硅烷硅氢化，气相法二氧化硅固载，再与氯亚铂酸钾反应，得到二种新型二氧化硅固载苯并冠醚铂配合物，它们在用量为烯烃摩尔量１０－５时，烯烃与三乙氧基硅烷的硅氢加成反应仍能顺利进行．

SYNTHESES AND PROPERTIES OF SILICA-SUPPORTED ALLYLOXYMETHYL BENZOCROWN ETHERS

Two allyloxymethyl benzocrown ethers, 9-allyloxymethyl 2-, 3-benzo-15-Crown-5 and 18-C-6 were synthesized. The crown ethers were subjected to hydrosilylation with triethoxysilane in the presence of tetrakis (triphenylphosphine) platinum complex,followed by hydrolysis and immobilization on fumed silica,followed by treating with potassium chloroplatinate to give the immobilization platinum complexes. The platinum complexes exhibited high catalytic activity in the hydrosilylation of olefins with triethoxysilane. The turnover number of olefin could be amounted to 40 000 and 93 000 for Sil-15-C-Pt and Sil-18-C-6-Pt,respectively,in one run. The effects of the nature of substrates, the amount of complex used,and the reaction temperature on catalytic activity were investigated. They could berecovered and reused several times with gradual decreases in activity.