Abstract
Hydrolysis of 1,2-diphenyl-4-R-cyclopentadienyl titanium trichloride (R = Me ( 1), n-Bu ( 2)) affords the corresponding oxo-bridged monocyclopentadienyl titanium compounds (1,2-Ph 2-4-R-CpTiCl 2) 2(μ-O) (R = Me ( 3), n-Bu ( 4)), new dinuclear species. The molecular structures of complexes 3 and 4 have been confirmed by single-crystal X-ray diffraction. Both complexes have been characterized by elemental analysis, 1H and 13C NMR spectroscopy. When activated with Al( i Bu) 3 and Ph 3 C + B ( C 6 F 5 ) 4 - , complexes 3 and 4 show reasonable catalytic activity for ethylene polymerization, producing polyethylenes with moderate molecular weights, and upon activation with methylaluminoxane (MAO), complexes 3 and 4 exhibit high catalytic activity and syndiospecificity for the polymerization of styrene.
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