作者:Matthias W. Hussong、Frank Rominger、Petra Krämer、Bernd F. Straub
DOI:10.1002/anie.201404032
日期:2014.8.25
Gold–carbene complexes are essential intermediates in many gold‐catalyzed organic‐synthetic transformations. While gold–carbene complexes with direct, vinylogous, or phenylogous heteroatom substitution have been synthesized and characterized, the observation in the condensed phase of electronically non‐stabilized gold–carbenes has so far remained elusive. The sterically extremely shielded, emerald‐green
金卡宾络合物是许多金催化的有机合成转化中必不可少的中间体。尽管已经合成并表征了具有直接,乙烯基或苯基杂原子取代的金卡宾络合物,但到目前为止,对电子不稳定的金卡宾在缩合相中的观察仍然难以捉摸。现在,已经合成,分离并充分表征了具有极强屏蔽作用的翠绿色复合物[IPr ** Au = CMes 2 ] + [NTf 2 ] -。与528 nm的红紫色碳正离子[Mes 2 CH] +相比,其在642 nm处的最大吸收值清楚地表明,金不仅是“软质子”。