reaction determined. Reaction of (PPh3)2Ni(CO)2 with L3 gave complex 5, which is stable at 20 °C. Complexes 3c/t were shown to react quantitatively to give compound 5 under an atmosphere of CO. Selective isotopic labeling with 13CO proved that an activation similar to that observed with Ni(COD)2 occurs in complex 5 at 95 °C but much more slowly and is accompanied by the formation of complex 4. Molecular
                                    Ni(COD)2与含有
联苯亚单元的
配体(P(i Pr)2 -O-Ph-Ph-OP(i Pr)2,L1)反应生成化合物的混合物,其主要产物为[ L1 ] Ni(COD),可以使用双(对
甲苯甲酰基)
乙炔定量转移到产物2中。可能的活化产物,顺式-和反式- 3(3 Ç和3吨分别),这是由于桥连的CC单键断裂而单独合成的。检查了顺式/反式异构化的机理,确定了活化参数并进行了捕集试验。(PPh 3)2 Ni(CO)2与L1的反应通过
配体交换反应得到了新的络合物4。该化合物在5 bar的CO气氛下加热到95°C数天后,缓慢将CO掺入桥接的CC单键中。此行为以及13种CO的同位素标记实验表明,在复杂4中CO解离后然后,诱导
金属中心与
联苯部分之间的相互作用,从而导致活化。Ni(COD)2与含有
二苯甲酮部分的P(i Pr)2 -O-Ph-CO-Ph-O-(P(i Pr)2(L3)在20°C时发生PhC-CO键,形成3