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

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• 作者：Jianfeng Zhao^a ; Long Yang^a ; Kaiqi Ge^a ; Qian Chen^a ; Yongzhong Zhuang^a ; Changsheng Cao^a ; ; Yanhui Shi^a ; ^b ; ^{yhshi_2000@126.com}
• 关键词：Dipalladium ; N-heterocyclic carbene ; Alkane bridge ; X-ray structure ; Heck reaction
• 刊名：Inorganic Chemistry Communications
• 出版年：2012
• 出版时间：June, 2012
• 年：2012
• 卷：20
• 期：Complete
• 页码：326-329
• 全文大小：326 K

文摘

A series of di-NHC dipalladium complexes Pd₂LPy₂Cl₄ (L = L^C3, L^C5, L^C6 and L^C10) with alkyl bridges of different chain lengths were prepared. The molecular structures of Pd₂L^C3Py₂Cl₄ (1) and Pd₂L^C6Py₂Cl₄ (3) were determined by X-ray diffraction studies. The influence of the different bridges on the structure and reactivity of the complexes was studied. The structure of complex 3 consists of two pseudo-square-planar subunits in a trans configuration, however complex 1 shows an X configuration due to ¦Ð-¦Ð stacking of both imidazole rings and pyridine rings. The catalytic activity of the new binuclear palladium complexes was successfully tested in the Mizoroki-Heck reaction of styrene with aryl bromides. The length of the bridged ligands had some effect on the yield and regioselectivity of the products.