AbstractMonocarbonyl rhodium complex LRh(CO), 1, which is stabilized by a pyrrole‐based bis(phosphinimine) pincer ligand (L=κ3‐NNN’=2,5‐[iPr2P=N(4‐iPrC6H4)]2‐N’(C4H2)−), serves as a versatile platform for the dehydrogenation of group 14 substrates. Reaction with primary and secondary silanes and germanes (MesSiH3, Et2SiH2, Ph2GeH2, tBuGeH3; Mes=mesityl) liberates H2 and yields base‐stabilized tetrylene compounds of the form κ2‐L(CO)Rh(ER2) (E=Si: R=Mes, H, 2; R=Et, 5; E=Ge: R=Ph, 6; R=tBu, H, 8). The “:ER2” fragment in these species bridges between the rhodium center and a phosphinimine donor. Preliminary reactions between pinacol (Pin) and κ2‐L(CO)Rh(ER2), E=Si, Ge, indicate that such complexes can serve as silylene and germylene synthons, releasing :ER2 and catalytically generating PinER2. In contrast, combination of complex 1 and MesGeH3 does not yield the anticipated dehydrogenation product, but rather, transmetalation similar to that observed upon reaction between 1 and 3,5‐dimethylphenylborane prevails.
摘要单羰基铑络合物 LRh(CO) 1 由基于吡咯的双(膦酰亚胺)钳配体(L=κ3-NNN'=2,5-[iPr2P=N(4-iPrC6H4)]2-N'(C4H2)-)稳定,是第 14 组底物脱氢的多功能平台。与伯硅烷、仲硅烷和锗(MesSiH3、Et2SiH2、Ph2GeH2、tBuGeH3;Mes=甲硅烷基)反应释放出 H2,并生成形式为 κ2-L(CO)Rh(ER2)的碱稳定四甲苯化合物(E=Si:R=Mes,H,2;R=Et,5;E=Ge:R=Ph,6;R=tBu,H,8)。这些物质中的":ER2 "片段在铑中心和膦酰亚胺供体之间架桥。嚬哪醇(Pin)与κ2-L(CO)Rh(ER2)(E=Si、Ge)的初步反应表明,这些复合物可以作为硅烯和亚甲二氧基烯的合成物,释放出 :ER2 并催化生成 PinER2。相反,复合物 1 与 MesGeH3 的结合并没有产生预期的脱氢产物,而是出现了类似于 1 与 3,5-二甲基苯基硼烷反应时观察到的跨金属化现象。