National Changhua University of Education Institutional Repository : Item 987654321/18913
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题名: A Convenient Synthesis of Phosphine-functionalized N-heterocyclic Carbene Ligand Precursors, Structural Characterization of Their Palladium Complexes and Catalytic Application in Suzuki Coupling Reaction
作者: Lee, Hon Man;Chiu, Pei-Ling;Zeng, Jing-Yao
贡献者: 化學系
日期: 2004-11
上传时间: 2014-08-14T04:28:58Z
出版者: Elsevier
摘要: A series of imidazolium chlorides as ligand precursors, L · HCl (L = (1-R)-(3-diphenylphosphanylethyl)-imidazol-2-ylidene; R = aryl, benzyl, naphthylmethyl), for the phosphine-functionalized N-heterocyclic carbene (NHC), L, were prepared by a convenient synthetic procedure of reacting 1,2-dichloroethane with appropriate N-substituted imidazoles to give (β-chloroethyl)imidazolium chlorides, which were subsequently reacted with HPPh2 producing L · HCl in good yield. Palladium complexes of L, PdLCl2 (4), were prepared by a one pot reaction of PdCl2, sodium acetate, and L · HCl in DMSO. Complexes 4b (R = naphthylmethyl) and 4e (R = m-methoxybenzyl) were characterized by X-ray crystallography. Catalytic studies have shown that the palladium complexes are efficient in Suzuki coupling reactions of aryl bromides with phenylboronic acid.
關聯: Inorganica Chimica Acta, 357(14): 4313-4321
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