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題名: | 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 |
貢獻者: | 化學系 |
日期: | 2004-11
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上傳時間: | 2014-08-14T04:28:58Z
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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 |
顯示於類別: | [化學系] 期刊論文
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