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Title: Synthesis and Structural Characterization of Metal Complexes Based on Pyrazole/Imidazolium Chlorides
Authors: Lee, H. M.;Chiu, P. L.;Hu, Ching-Han;Lai, C. L.;Chou, Y. C.
Contributors: 化學系
Keywords: Pyrazole;Imidazolium chlorides;Gauche preference;Palladium complex;X-ray determination;Heck reaction
Date: 2005-01
Issue Date: 2012-05-03T06:17:53Z
Publisher: Elsevier
Abstract: 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.
Relation: J. Organometallic Chem., 690(2): 403-414
Appears in Collections:[Department of Chemistry] Periodical Articles

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