The isolation of an equally active amidoiridium catalyst, [(Ph2PCH2CMe2NH)Ir(COD)], its ability to oxidatively add dihydrogen, and the observation of both H2/D+ and H2/D2 exchange reactions during catalysis, which crucially depends on the use of protic solvents, provided evidence for a mechanism involving hydride and proton transfer as well as heterolytic H2 cleavage on dihydrogen–hydrido–amido and
摘要 通过使用衍生自旋光 β-
氨基膦的碱改性 Ir 和 Rh 催化剂,
苯乙酮对映选择性还原为 1-苯基
乙醇(21-71% ee),[(1R,2S)-, (1R,2R)- , (1S,2S)-Ph2PCH(Ph)CH(Me)N(H)R}M(COD)]BF4–KOH (R=H, Me, i-Pr, CH2Ph),在
甲醇中,在 H2 (10 bar) )。分离出同样活性的酰胺
铱催化剂 [(Ph2PCH2CMe2NH)Ir(COD)],其氧化添加双氢的能力,以及在催化过程中观察 H2/D+ 和 H2/D2 交换反应,这主要取决于使用质子溶剂,为涉及
氢化物和质子转移以及二氢 - 氢化 - 酰胺和二氢化 - 胺互变异构体,['P∩NR'}Ir(H2)H] + 和 ['分别为 P∩N(H)R'}IrH2]+。