analysis. Complexes 1a and 2a serve as highly efficient catalysts for Z-selective hydrosilylation of phenylacetylene. The reason for the high catalyst efficiency of DPCB-OMe complexes has been investigated by reaction and structure analysis of the presumed intermediate [Ru(CH═CHPh)Cl(CO)(DPCB-OMe)] (3a). It has been found that 3a has ample space to associate with hydrosilane and, therefore, readily
                                    配合物[RuCl(μ-Cl)(CO)(
DPCB-OMe)] 2(1a),带有低配位的
磷配体(
DPCB-OMe = 1,2-双(4-
甲氧基苯基)-3,4-双[(2,4,6-三-
叔丁基苯基)亚膦]
环丁烯),可以容易地降低到[期RuH(μ-Cl)的(CO)(
DPCB-OME)] 2(2A通过与
水的反应)和HSiMe 2 Ph。该反应通过[RuCl 2(CO)(H 2 O)(
DPCB-OMe)]中间体进行,该中间体的特征在于X射线衍射分析。配合物1a和2a充当Z的高效催化剂
苯乙炔的选择性氢化
硅烷化。通过对推测的中间体[Ru(CH catalystCHPh)Cl(CO)(
DPCB-OMe)](3a)的反应和结构分析,研究了
DPCB-OMe配合物催化剂效率高的原因。已经发现3a具有与氢
硅烷缔合的足够空间,因此容易在Ru-C和H-Si键之间进行易位。这种结构特征与
DPCB-OMe
配体的强π接受能力相结合