Synthesis and Reactivity of N-Heterocyclic Carbene Gold(I) and Gold(III) Imidate Complexes and Their Catalytic Activity in 1,5-Enyne Cycloisomerization

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• 作者：Jonathan P. Reeds ; Adrian C. Whitwood ; Mark P. Healy ; Ian J. S. Fairlamb
• 刊名：Organometallics
• 出版年：2013
• 出版时间：May 24, 2013
• 年：2013
• 卷：32
• 期：10
• 页码：3108-3120
• 全文大小：611K
• 年卷期：v.32,no.10(May 24, 2013)
• ISSN：1520-6041

文摘

The effects of substituting (pseudo)halide for anionic imidate ligands in Au(I) and Au(III) (i.e. [AuBr(NHC)] and [AuBr₃(NHC)]) complexes have been investigated. [Au(N-imidate)(NHC)] and [AuBr₂(N-imidate)(NHC)] complexes were prepared and the structure and bonding of the complexes examined spectroscopically and crystallographically. The [AuBr₂(N-imidate)(NHC)] complexes, in combination with Ag salts, were tested for catalytic activity in the cycloisomerization of 1,5-enynes and found to be more effective than the tribromide analogues (e.g. [AuBr₃(NHC)]). Subtle changes to the anionic imidate ligand structure had a pronounced effect on the catalytic activity of the Au(III) complexes.