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题名: Synthesis and Structural Characterization of Metal Complexes Based on Pyrazole/Imidazolium Chlorides
作者: Lee, H. M.;Chiu, P. L.;Hu, Ching-Han;Lai, C. L.;Chou, Y. C.
贡献者: 化學系
关键词: Pyrazole;Imidazolium chlorides;Gauche preference;Palladium complex;X-ray determination;Heck reaction
日期: 2005-01
上传时间: 2012-05-03T06:17:53Z
出版者: Elsevier
摘要: A series of imidzoalium salt, L � HCl, for the potentially bidentate pyrazole/N-heterocyclic carbene was synthesized. Reactions of a 2:1 mixture between L � HCl bearing bulky N-substitution and Ag2O produced Ag(L)Cl, whereas a novel compound with unique stoichiometry AgL2(AgCl)0.5Cl was produced from L � HCl bearing N-methyl group under identical condition. Reactions of L � HCl with PdCl2 produced zwitterionic PdIICl3L � H. Selected structural determinations on L � HCl, Ag(L)Cl, AgL2(AgCl)0.5Cl, and PdIICl3L � H revealed intriguing crystal chemistry in which the less-stable gauche rotamers were obtained exclusively. A preliminary application of the zwitterionic complexes, PdIICl3L � H, in Heck coupling reaction of aryl bromide with n-butyl acrylate shows effective activity.
關聯: J. Organometallic Chem., 690(2): 403-414
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