calculation is in support of the experimental findings. Unlike the previous reported palladium analogues, NiL12 and Ni(L2H1)2, in the presence of PPh3 as cocatalyst, are highly efficient in catalyzing the Suzuki cross-coupling reaction of aryl chlorides with phenylboronic acid. A 3 mol % of NiL12 (Ni:PPh3 = 1:2) was sufficient to mediate the formation of 4-methoxy-1,1‘-biphenyl from 4-chloroanisole in
由
配体前体[L 1 H 1 H 2 ] Cl和[L 2 H 1 2 H 2 ] Cl( H 1 = N H C O,H 2 = NC H N),产率为48-82%。NiL 1 2和Ni(L 2 H 1)2的络合物在空气和湿气中稳定。它们的特征在于NMR(1D和2D)和单晶X射线衍射研究。根据NMR,晶体学和PXRD研究,NiL 1 2络合物之一经历了一个有趣的可逆溶剂诱导的顺/反转化过程,用
DMSO和CHCl 3产生了顺式。交换过程具有很高的特异性,可以用较高极性的cis-NiL 1 2来解释,这有利于极性
DMSO溶剂,而由于
配体的转位取消了极性而导致的极性较小的反式则有利于极性较小的CHCl 3溶剂。DFT计算支持实验结果。与先前报道的
钯类似物不同,在PPh 3作为助催化剂的情况下,NiL 1 2和Ni(L 2 H 1)2在催化芳基
氯化物与苯基
硼酸的Suzuki交叉偶联反应中非常有效。3