Binuclear palladium complexes bridged by dicarbene with different lengths and their application in Mizoroki–Heck reaction
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- 作者：Changsheng Cao ; Yongzhong Zhuang ; Jianfeng Zhao ; Yu Peng ; Xiuling Li ; Zhan Shi ; Guangsheng Pang ; Yanhui Shi
- 关键词：Binuclear ; N-Heterocyclic carbene ; Palladium ; Heck reaction
- 刊名：Inorganica Chimica Acta
- 出版年：2010
- 出版时间：25 November 2010
- 年：2010
- 卷：363
- 期：14
- 页码：3914-3918
- 全文大小：536 K
文摘
A series of di-NHC ligands with alkyl bridges of different chain lengths (n = 2–4) and their bi-palladium complexes (4, 5 and 6) have been prepared. The molecular structure of 4 and 6 were determined by X-ray diffraction studies. The structures of complex 4 consist of two pseudo-square-planar subunits in a trans configuration, however 6 consist of two subunits in a cis configuration with π–π stacking between two pyridines. The influence of the different bridges on the structure and reactivity of the complexes has been studied. The catalytic activity of the new binuclear palladium complexes was successfully tested in the Mizoroki–Heck reaction of styrene with bromobenzene. The complex with 2 and 4 carbon linker gave higher yield, while the one with 3 carbon linker gave better regioselectivity.