Patent ID: 8410295

Claim:
A complex represented by any of the following formulae (I), (I′), (II), (II′), (III), (III′), (IV), and (IV′): wherein: R 1 s are independently an alkyl group or an aryl group; R 2 s are independently a hydrogen atom, an alkyl group or an aryl group; R 3 s are independently an alkyl group or an aryl group, provided that two R 3 s are optionally bonded with each other to form a ring; R 4 s are independently a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a nitro group or a cyano group; and M is TiY 2 , wherein Y is Cl or alkoxide or the complex forms a di-μ-oxo dimer where Y is a μ-oxo ligand.