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Abstract
A series of titanium phosphinimide complexes [Ph 2P(2-RO-C 6H 4)] 2TiCl 2 ( 7, R = CH 3; 8, R = CHMe 2) and [PhP(2-Me 2CHO–C 6H 4)][THF]TiCl 3 ( 9) have been prepared by reaction of TiCl 4 with the corresponding phosphinimines under dehalosilylation. The structure of complex 9 has been determined by X-ray crystallography, and a solvent molecule THF was found to be coordinated with the central metal and the Ti–O bond was consistent with the normal Ti–O (donor) bond length. The complexes 7 and 8 displayed inactive to ethylene polymerization, and the complex 9 displayed moderate activity in the presence of modified methylaluminoxane (MMAO) or i-Bu 3Al/Ph 3CB(C 6F 5) 4, and this should be partly attributed to coordination of THF with titanium and the steric effect of two iso-propoxyl. And catalytic activity up to 32.2 kg-PE/(mol-Ti h bar) was observed.
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