Coupling of Coordinated 2-Iminophosphorano-1-phosphaallyl Leading to Bridged Iminophosphoranato Complexes of Zirconium and Hafnium

Reaction of MCl₄ (M = Zr, Hf) with 2 equiv of 2-iminophosphorano-1-phosphaallyl lithium [Li{P(Ph)C(CHPh)P(Me)₂NSiMe₃}(THF)_1.5] (1) affords ligand coupling complexes 3 and 4, respectively, while similar treatment of ZrCl₄ with [Li{P(Ph)C(C(SiMe₂Bu^t)Ph)P(Me)₂NSiMe₃}(THF)₂] (2) yields ligand transfer complex 5.