A new synthetic entry to phosphinophosphinidene complexes.Synthesis and structural characterisation of the first side-on bonded and the first terminally bonded phosphinophosphinidene zirconium complexes mu-(l,2:2-eta-~tBu_2P=P){Zr(Cl)Cp_2}_2 and {

摘要

The reactions of lithiated diphosphanes with transition metal chlorides constitute a new general entry to phosphinophosphinidene complexes:the reaction of Cp_2ZrCl_2(Cp=C_5H_5)with ~tBu_2P-P(SiMe_3)Li(molar ratio approx1:1)yields mu-(l,2:2-eta-~tBu_2P=P){Zr(Cl)Cp_2}_2;the reaction of Cp_2ZrCl_2 with ~tBu_2P-P(SiMe_3)Li(molar ratio approx1 :2)and an excess of PPhMe_2 in DME yields the first terminally bonded phosphinophosphinidene complex,{Zr(PPhMe_2)Cp_2}(eta~1-P-P~tBu_2).