Synthesis and Characterization of Half-Metallocene Dialkyl Complexes of Hafnium with Bidentate Iminopyrrolyl Ligands and Their Catalytic Olefin Polymerization

摘要

Non-bridged half-metallocene dimethyl complexes of hafnium 3a-c bearing N-substituted iminomethylpyrrolyl ligands 2a-c have been synthesized and characterized by NMR spectroscopy as well as X-ray analyses for 3a and 3b.These complexes become active catalysts for 1-hexene polymerization upon treated by [Ph_3C][B(C_6F_s)_4] and iso-rich living polymerization was achieved at low temperature.