Titanium(IV) complexes with monocyclopentadienyl and phenoxy-alkoxo ligands: Synthesis, structures and catalytic properties for ethylene polymerization

Three monochlorotitanium complexes Cp′Ti(2,4-tBu2-6-(CPh2O)C6H2O)Cl [Cp′ = η5-C5H5 (2), η5-C5(CH3)5 (3), η5-C5H2Ph2CH3 (4)] have been synthesized in high yields (>90%) by the reaction of corresponding Cp′TiCl3 with the dilithium salt of ligand 2,4-tBu2-6-(CPh2OH)C6H2OH (1). When activated by [Ph3C]+[B(C6F5)4]− and AliBu3, complexes 2–4 exhibit reasonable catalytic activity for ethylene polymerization, producing polyethylenes with moderate molecular weights and melting points. Addition of excess water to complex 2 gave the oxo-bridged complex [Ti(η5-C5H5)(2,4-tBu2-6-(CPh2O)C6H2O)]2O (5). Complexes 4 and 5 were characterized by single crystal X-ray diffraction.

Three monochlorotitanium complexes with monocyclopentadienyl and phenoxy-alkoxo ligands [Cp′Ti(2,4-tBu2-6-(CPh2O)C6H2O)] (Cp′ = η5-C5H5 (2), η5-C5(CH3)5 (3), η5-C5H2Ph2CH3 (4)) have been synthesized and characterized. Complexes 2, 3 and 4 have been studied as catalysts for ethylene polymerization in the presence of [Ph3C]+[B(C6F5)4]− and AliBu3 as co-catalyst and good activities were observed. Addition of excess water to complex 2 gave the oxo-bridged complex [Ti(η5-C5H5)(2,4-tBu2-6-(CPh2O)C6H2O)]2O (5).Figure optionsDownload as PowerPoint slide