Low-Valent Ene–Amido Iron Complexes for the Asymmetric Transfer Hydrogenation of Acetophenone without Base

Examination of the role of base in the activation of our previously reported iron(II) complexes having the general formula [Fe(CO)(Br)(PNNP)][BPh4] revealed a five-coordinate iron(II) complex in which the tetradentate PNNP ligand had been doubly deprotonated. The new iron(II) complexes were used in the transfer hydrogenation of acetophenone in isopropanol in the absence of added base, and certain analogues showed catalytic activity.

我们对此前报道的通式为[Fe(CO)(Br)(PNNP)][BPh4]的二价铁配合物(iron(II) complexes)的碱活化机制展开考察，结果发现了一种五配位二价铁配合物，该配合物中的四齿PNNP配体(tetradentate PNNP ligand)发生了双去质子化。将此类新型二价铁配合物应用于无外加碱的异丙醇溶剂中苯乙酮的转移氢化(transfer hydrogenation)反应，其中部分类似物展现出催化活性。