Phenoxy–Ether Ligated Ti Complexes for the Polymerization of Ethylene

Bis(phenoxy-ether) Ti complexes were investigated as ethylene polymerization catalysts. The complexes combined with iBu3Al/Ph3CB(C6F5)4 or methylaluminoxane (MAO) cocatalysts, can be highly active single-site lysts, which display activites (tumover frequency, max 2065 min -1 ) comparable with that of a highly active bis(phenoxy-imine) Ti complex/MAO system, and provide very high molecular weight polyethylenes (M v 2040000-5 420 000) at 25 °C under atmospheric pressure. Synthesis of polyethylene using bis(phenoxy-ether) Ti complexes, an example of which is shown.