Synthesis, structure and catalytic activity of dicarbene dipalladium complexes with different substituents

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• 作者：Long Yang ; Jianfeng Zhao ; Yunfei Li ; Kaiqi Ge ; Yongzhong Zhuang ; Changsheng Cao ; Yanhui Shi
• 关键词：Dipalladium ; N-heterocyclic carbene ; Ethylene bridge ; Different substituent ; Mizoroki&ndash ; Heck reaction
• 刊名：Inorganic Chemistry Communications
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：22
• 期：Complete
• 页码：33-36
• 全文大小：375 K

文摘

A series of ethylene bridged di-NHC dipalladium complexes (1-5) with different substituents on N of imidazolydene were prepared. The influence of the different substituents on the structure and catalytic reactivity of the complexes were studied. The molecular structures of 3 and 4 were determined by X-ray diffraction studies. The structures of complexes consist of two perpendicular pseudo-square-planar subunits in a cis configuration. The catalytic activity of the new binuclear palladium complexes was successfully tested in the Mizoroki-Heck reaction. The complexes with aryl substituent have better activity than that with alkyl substituent, meanwhile, the different substituents on phenyl group have a little effect on both regioselectivity and the yield of the product as well.