Preparation of [bis(amido)-phosphine] and [amido-phosphine sulfide or oxide] hafnium and zirconium complexes for olefin polymerization

[Bis(amido)-phosphine] and [amido-phosphine sulfide or oxide] hafnium and zirconium complexes are prepared and the molecular structures of [amido-phosphine sulfide]Hf(CH2Ph)3, [bis(amido)-phosphine]ZrMe2, and [amido-phosphine-amine]MCl3 were confirmed by X-ray crystallography. The [amido-phosphine sulfide]Hf(CH2Ph)3 exhibited relatively high copolymerization activity (19 × 106 g/mol-Hf h).