Synthesis, characterization and ethylene (co-)polymerization behavior of half-titanocene 2-(1-(arylimino)ethyl)quinolin-8-olate chlorides

Abstract

The series of half-titanocene 2-(1-(arylimino)ethyl)quinolin-8-olate dichlorides, Cp′TiCl₂L (Cp′ = η⁵-C₅H₅ or η⁵-C₅Me₅, L = 2-(1-(2,6-R¹-4-R²-phenylimino)ethyl)quinolin-8-olate), was synthesized via the stoichiometric reaction of Cp′TiCl₃ with the corresponding potassium salt, viz.2-(1-(2,6-R¹-4-R²-phenylimino)ethyl)quinolin-8-olate. All compounds were characterized by elemental analysis, ¹H and ¹³C NMR spectroscopy. The molecular structures of complexes C2 and C4 were determined by single-crystal X-ray diffraction. When activated with methylaluminoxane (MAO), all half-titanocene pre-catalysts exhibited high activities for ethylene polymerization and co-polymerization with α-olefins or norbornene.