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以烟雾法二氧化硅为载体的聚—4—氧杂—6—羟基—7—二苯膦基庚基硅氧烷和氯亚钯酸钠四水合物作用制备的高分子钯络合物,在30—50℃和适当的溶剂中对烯烃的常压加氢具有良好的活性和选择性。苯乙烯、α—甲基苯乙烯、丙烯酸及其酯可在1.5—2.5小时内平稳地氢化完全,环戊二烯、α—蒎烯、芳基、羧基和酯基在同样条件下不能氢化。甲醇、异丙醇、醋酸等质子溶剂对其催化活性有显著的促进作用,但某些非质子溶剂,如二甲基甲酰胺、苯也有良好效果。水也可以作为反应介质。因此,这一聚合物催化剂特别适用于和芳基、氰基、羧基及酯基直接相连的双键的氢化。除此之外,它还可以回收再用而催化活性没有显著降低。
The polymeric palladium complex prepared by the action of fumed silica as carrier, poly-4-oxa-6-hydroxy-7-diphenylphosphinoheptylsiloxane and sodium chloropalladate tetrahydrate, Atmospheric hydrogenation of olefins at 30-50 ° C in a suitable solvent has good activity and selectivity. Styrene, α-methylstyrene, acrylic acid and its esters can be smoothly hydrogenated completely in 1.5-2.5 hours. Cyclopentadiene, α-pinene, aryl, carboxyl and ester groups can not be hydrogenated under the same conditions. Proton solvents such as methanol, isopropanol and acetic acid have significant catalytic activity, but some aprotic solvents such as dimethylformamide and benzene also have good effect. Water can also act as a reaction medium. Therefore, this polymer catalyst is particularly suitable for the hydrogenation of double bonds directly connected to aryl groups, cyano groups, carboxyl groups and ester groups. In addition, it can be reused without significant reduction in catalytic activity.