The treatment of a variety of hydrosilanes, each incorporating a benzylic C(sp3)–H bond, with a rhodium catalyst resulted in intramolecular dehydrogenativesilylation. This silylation reaction was found to occur at typically unreactive C(sp3)–H bonds located at terminal positions on alkyl chains. Interestingly, the rhodium catalyst also promoted regioselective silylation at a site internal to an alkyl
phosphine ligands on the rhodium-catalyzed dehydrogenative silylation and germylation of unactivated C(sp3)–H bonds. The reactivity was affected by the steric and electronic nature of the phosphine ligands. The use of the bulky and electron-rich diphosphine ligand (R)-DTBM-SEGPHOS was highly effective to yield the dehydrogenative silylation products selectively in the presence of a hydrogen acceptor
当前的工作描述了膦配体在铑催化的未活化的C(sp 3)–H键的脱氢甲硅烷基化和发芽化上的明显加速。反应性受膦配体的空间和电子性质影响。使用庞大且富含电子的二膦配体(R)-DTBM-SEGPHOS在氢受体存在下选择性地产生脱氢甲硅烷基化产物非常有效。的适当选择Ç 2 -对称的手性二膦配体允许通过C(SP的对映选择性desymmetrization不对称脱氢硅烷化3)-H键。C(sp 3还使用铑配合物和宽咬角二膦配体的组合检测了具有脱氢作用的–H键,从而以高收率提供了相应的2,3-二氢苯并[ b ]锗。