of the product of C-alkylation as a result of addition of AlEt3 to the C=N bond, and the reduction of Ni(II) to Ni(0) complexes. The absence of nickel clusters and a low concentration of coordinatively unsaturated Ni(0) complexes is the most probable reason of low catalytic activity of the studied system in hydrogenation catalysis.
定性地表征了
镍前体中酸性
配体的性质对烯烃加氢中齐格勒体系活性的影响。通过IR,NMR和ESR光谱法确定的双(二甲基乙二
肟酸
镍)
镍与
三乙基铝反应的关键步骤包括AlEt 3与二甲基乙二
肟酸
配体的OH基团之间的反应,C-烷基化产物的形成将AlEt 3添加到C = N键中,以及将Ni(II)还原为Ni(0)络合物的结果。缺乏
镍簇和低浓度的配位不饱和Ni(0)配合物是加氢催化研究体系催化活性低的最可能原因。