of simple and complex 1-alkenes with a variety of hydrosilanes. Catalysts derived from MesNQpy exhibited low activity. Fe-RPQpy derived catalysts favor hydrosilylation, whereas Co-RPQpy based catalysts favor dehydrogenative silylation. Catalysts derived from CoX2(iPrPQpy) convert hydrosilanes and ethylene to vinylsilanes. Related experiments were conducted on propylene to give propenylsilanes.
制备了一种新的刚性平面
PNN
配体平台的Co和Fe二卤化物配合物,并将其作为烯烃氢化
硅烷化的预催化剂。将Thummel的8-
溴-2-(
吡啶-2'-基)
喹啉锂化,然后用(i- Pr)2 PCl和(C 6 F 5)2 PCl处理,得到膦-
喹啉-
吡啶配体,缩写为R PQpy对于R =i- Pr和C 6 F 5。这些
配体与
铁和
钴的二
氯化物和二
溴化物形成1:1加合物。FeBr 2(iPr PQpy),FeBr 2(ArFPQpy),CoCl 2(iPr PQpy),CoBr 2(iPr PQpy)和CoCl 2(ArF PQpy)证实这些配合物的M–P–C–C–N–C–C–N部分在0.078范围内为平面不同于前几代的
PNN配合物,其平面度偏差约为0.35。键距和磁性表明Fe络合物为高自旋,而
钴络合物为高自旋或参与自旋平衡。还研究了R PQpy
配体的NNN类似物,其中膦基被
异丁烯酮取代。FeBr 2(Mes