An Unsaturated Nickel(0) NHC Catalyst: Facile Preparation and Structure of Ni(0)(NHC)2, Featuring a Reduction Process from Ni(II)(NHC)(acac)2

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• 作者：Kouki Matsubara ; Satoshi Miyazaki ; Yuji Koga ; Yoshinori Nibu ; Takaaki Hashimura ; Taisuke Matsumoto
• 刊名：Organometallics
• 出版年：2008
• 出版时间：November 24, 2008
• 年：2008
• 卷：27
• 期：22
• 页码：6020-6024
• 全文大小：157K
• 年卷期：v.27,no.22(November 24, 2008)
• ISSN：1520-6041

文摘

A facile synthetic route to Ni(0)(NHC)₂ from stable Ni(II)(acac)₂ was established without common but labile Ni(0) precursors. The intermediate is a divalent mono-NHC adduct of Ni(acac)₂, Ni(NHC)(acac)₂. Reduction of Ni(NHC)(acac)₂ in both the presence and absence of an NHC ligand gave Ni(NHC)₂ in ca. 90% and 40% conversions, respectively. Ni(NHC)₂, especially with bis(2,6-diisopropylphenyl)imidazolin-2-ylidene, has strong Ni−C(carbene) bonds and remarkable anagostic Ni−H(methyl) interactions, stabilizing its 14e unsaturated structure.