Zwitterionic catalyst comprising a monoanionic bidentate imine ligand

摘要

The invention relates to an organometallic compound according to formula (I), wherein M is a group 4 metal with valency v, with v being 3 or 4, preferably Ti, Y is a monoanionic bidentate imine ligand according to formula (2) wherein E is a carbon or nitrogen atom, B is an optionally bridging moiety, Z is an oxygen or nitrogen comprising group and R is an optionally substituted hydrocarbyl group, X_m is an anionic ligand with m = = 1, with m = v - 2, m being the number of anionic ligands, and Q_r is a coordinating ligand which is a Lewis base with r = 0 being the number of ligands, and R₁, R₂, R₃, R₄, R₅, R₆, R₇, R₈ and R₉ can be chosen independently from hydrogen atoms and optionally substituted alkyl or aryl groups having 1 to 20 carbon atoms. The invention further relates to the use of the compound according to Formula (I) as a catalyst for the preparation of polyolefins.