New [Au(NHC)(OH)] Complexes for Silver-Free Protocols

Novel (NHC)­gold­(I) hydroxides are reported. Their differing tolerances to air and moisture are rationalized by the varying abilities of the NHC ligands to sterically protect the reactive metal center. A number of gold hydroxides were used in the silver-free preparation of Gagosz-type catalysts. This general procedure led to analytically pure products while avoiding the use of expensive silver reagents.本文报道了一类新型N-杂环卡宾（N-Heterocyclic Carbene，NHC）配体稳定的金(I)氢氧化物。这类配合物对空气与湿气的耐受性存在差异，该现象可通过NHC配体空间位阻保护活性金属中心的能力差异得到合理解释。多款此类金氢氧化物可用于无银路线制备加戈斯型（Gagosz-type）催化剂。该通用合成方法可获得分析纯级产物，同时无需使用成本高昂的银基试剂。