Abstract
Permethylated cyclopentadienyl dinuclear constrained geometry titanium catalyst, [μ-(C 6H 4) 2-2,2′]{(η 5-C 5Me 3)[1-Me 2Si(η 1-N- t Bu)](TiCl 2)} 2 ( BPTi 2 ) linked by a biphenylene bridge was synthesized and tested in ethylene and ethylene/1-octene polymerizations upon activation by TIBA (triisobutylaluminum)/[Ph 3C][B(C 6F 5) 4]. When compared with the corresponding highly active, mononuclear analogs, Me 2Si(η 5-2-PhC 5Me 3)(η 1-N- t Bu)TiCl 2 ( PhTi 1 ) and Me 2Si(η 5-C 5Me 4)(η 1-N- t Bu)TiCl 2 ( MeTi 1 ), BPTi 2 exhibits significantly increased molecular weight of polymer (>two-fold), as well as high level of activity and 1-octene incorporations in ethylene and ethylene/1-octene polymerizations. Although the lower activity was observed at high 1-octene feeds, the combined effects of rigidity and electronic conjugation induced by the biphenylene bridge might be responsible for the observed polymerization properties of BPTi 2 .
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