Patent ID: 6683199
Filing Date: 2004-01-27
Classification: C07F

Abstract:
A dicationic Group 4 metal compound corresponding to the formula: wherein:Y1 and Y2 independently each occurrence is an anionic ligand group that is covalently bonded to M by means of a sigma bond through a nitrogen atom, and containing up to 50 atoms, not counting hydrogen, said Y1 and Y2 being joined through bridging group, J, and optionally, Y1 and Y2 may also contain a coordinate/covalent bound to M; J is a divalent bridging group having up to 20 atoms not counting hydrogen; j is 1; M is a Group 4 metal; X1 independently each occurrence is a Lewis base; x1 is 0, 1 or 2; and Aâˆ’ independently each occurrence is an anion of up to 50 atoms other than hydrogen, derived or derivable from a Lewis acid, said Aâˆ’ optionally forming an adduct with the metal complex by means of a &mgr;-bridging group, and further optionally two Aâˆ’ groups may be joined together thereby forming a single dianion, optionally containing one or more &mgr;-bridging groups.