Oxidative addition of hydrosilanes, a hydrogermane, and a hydrostannane to the ((cyclopentadienylalkyl)phosphane)cobalt(I) chelate 1 results in the formation of cyclopentadienylhydridocobalt(III) complexes having a tethered phosphorus ligand and silyl (rac-4−rac-8), germyl (rac-10), and stannyl substituents (rac-11). The pseudo-four-coordinate complexes are chiral. The X-ray structures of 5 and 7 have
在((
环戊二烯基烷基)膦)
钴(I)螯合物1中氧化加氢
硅烷,氢
锗烷和氢
锡烷,导致形成
环戊二烯基氢化
钴(III)配合物,该配合物具有束缚的
磷配体和甲
硅烷基(rac - 4 - rac - 8),胚芽(rac - 10)和甲
锡烷基取代基(rac - 11)。伪四坐标复合物是手性的。5和7的X射线结构已经确定。可变温度NMR光谱表明,由于
磷配体的可逆解离,溶液中存在外消旋作用。据估计,该过程的势垒在13-16 kcal / mol的范围内。