Group 5 and 6 transition metal catalyst precursors

摘要

This invention relates to non-Group 4 transition metal composition useful as olefin polymerization catalysts, wherein the transition metal is in high oxidation state. The invention further relates to design of new ligand systems and methods of preparing and using the same. Compositions useful as catalyst precursors are neutral transition metal complexes comprising the unique ligand systems of the invention. The inventive compositions may be activated to a catalytic state by ion-exchange reagents or by Lewis acids.