Abstract
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.
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