Simple Synthesis of CpNi(NHC)Cl Complexes (Cp = Cyclopentadienyl; NHC = N-Heterocyclic Carbene)

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• 作者：Roy A. Kelly ; III ; Natalie M. Scott ; Silvia Dí ; ez-Gonzá ; lez ; Edwin D. Stevens ; and Steven P. Nolan
• 刊名：Organometallics
• 出版年：2005
• 出版时间：July 4, 2005
• 年：2005
• 卷：24
• 期：14
• 页码：3442 - 3447
• 全文大小：135K
• 年卷期：v.24,no.14(July 4, 2005)
• ISSN：1520-6041

文摘

The reaction of saturated and unsaturated imidazolium salts with nickelocene in refluxingTHF results in the formation of NHC complexes of general formula CpNi(NHC)Cl (NHC =SIMes (2), IPr (3), SIPr (4)). This protonation of Cp₂Ni was also tested using phosphonium salts, and the reaction of nickelocene with triethylphosphonium chloride leads toCpNi(PEt₃)Cl (5). All compounds were characterized by NMR and X-ray crystallography.The catalytic activity of the NHC compounds was tested in aryl amination (Buchwald-Hartwig reaction) and in aryl halide dehalogenation reactions.