Binuclear palladium complexes bridged by dicarbene with different lengths and their application in Mizoroki-Heck reaction |
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| Authors: | Changsheng Cao Jianfeng Zhao Xiuling Li Guangsheng Pang |
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| Affiliation: | a College of Chemistry and Chemical Engineering and Key Laboratory of Biotechnology for Medical Plant, Xuzhou Normal University, Xuzhou, Jiangsu 221116, PR China
b State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, Jilin 130012, PR China |
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| Abstract: | 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. |
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| Keywords: | Binuclear N-Heterocyclic carbene Palladium Heck reaction |
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