Instituto de Investigaciones Químicas, Departamento de Química Inorgánica, CSIC and Universidad de Sevilla, Sevilla, Spain.
J Am Chem Soc. 2013 Jul 31;135(30):10910-3. doi: 10.1021/ja404655v. Epub 2013 Jul 19.
Coordinatively unsaturated Pt(II) complex Pt(I(t)Bu')(I(t)Bu) stabilized by N-heterocyclic carbene (NHC) ligands dehydrogenates N,N-dimethylamineborane through a mechanism that involves hydride abstraction, assisted by an amine, to yield a platinum-hydride complex [PtH(I(t)Bu')(I(t)Bu)] with concomitant formation of the boronium cation (NHMe2)2BH2. This latter species is very likely in equilibrium with the THF stabilized borenium cation (NHMe2)(THF)BH2, bearing an acidic NH group that is able to protonate the platinum hydride [PtH(I(t)Bu')(I(t)Bu)] releasing H2, the amino borane H2B-NMe2 and regenerating the catalytic Pt species.
配位不饱和的 Pt(II) 配合物 [Pt(I(t)Bu')(I(t)Bu)]+，由 N-杂环卡宾 (NHC) 配体稳定，通过涉及氢化物抽提的机制使 N,N-二甲基胺硼烷脱氢，得到铂氢配合物 [PtH(I(t)Bu')(I(t)Bu)]，同时形成硼翁阳离子 [(NHMe2)2BH2]+。后一种物质很可能与 THF 稳定的硼翁阳离子 [(NHMe2)(THF)BH2]+处于平衡状态，带有一个酸性 NH 基团，能够质子化铂氢 [PtH(I(t)Bu')(I(t)Bu)]，释放出 H2、氨基硼烷 H2B-NMe2，并再生催化 [Pt]+物种。
