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以烟雾状二氧化硅为载体的聚-γ-(m-二苯膦苯基)丙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,在溶剂中和一个氢压下具有很高的烯烃加氢活性。例如,20毫克分子的苯乙烯在含有0.0033毫克原子钯的这种催化剂存在下,于40℃一小时内完全氢化。它的选择性也是很明显的。尽管苯乙烯、α-甲基苯乙烯、丙烯腈、丙烯酸及其酯在几小时内可以完全氢化,但环戊二烯、异戊二烯、α-蒎烯在同样条件下却完全不能氢化。苯基、氰基、酯基、羧基在反应中不受影响。因此,这一聚合物催化剂特别适用于和芳基、腈基、羧基和酯基相连的双键的氢化。此外,催化剂能再次使用,催化活性降低不严重。
A polymeric palladium complex prepared by the action of a fumed silica supported poly-γ- (m-diphenylphosphinophenyl) propylsiloxane and sodium chlorodipalladate tetrahydrate is dissolved in a solvent A hydrogen pressure has a high olefin hydrogenation activity. For example, 20 millimoles of styrene are completely hydrogenated in 40 hours at one hour in the presence of such a catalyst containing 0.0033 milligram atoms of palladium. Its selectivity is also obvious. Although styrene, alpha-methylstyrene, acrylonitrile, acrylic acid and their esters can be completely hydrogenated within a few hours, cyclopentadiene, isoprene, and alpha-pinene can not be hydrogenated at all under the same conditions. Phenyl, cyano, ester, carboxyl in the reaction is not affected. Therefore, this polymer catalyst is particularly suitable for the hydrogenation of double bonds to aryl, nitrile, carboxyl and ester groups. In addition, the catalyst can be reused, the catalytic activity is not reduced.