Olefin Polymerization Catalyzed by Titanium−Tungsten Heterobimetallic Dinitrogen Complexes¹

Abstract

A new family of highly active olefin polymerization catalysts based on titanium−tungsten heterobimetallic dinitrogen complexes, [Cp'TiCl2(μ-N2)WCl(L)4] (1; L = PMe2Ph, 1/2 R2PCH2CH2PR2; R = Et, Ph), has been developed, in which the tungsten dinitrogen fragment acts as a novel metallonitrogen ligand to the catalytically active titanium center. Alkylation of 1d (Cp' = C5Me5, L = 1/2 Et2PCH2CH2PEt2) with MeLi gave di- and trimethyl derivatives 2d and 3d, which were structurally characterized.