A set of Tp′TiCl 3 and Tp′TiCl 2 (OR) complexes containing tris(pyrazolyl)borate ligands with diverse steric properties has been evaluated for ethylene polymerization under MAO activation conditions (Tp′ ) HB(3-mesitylpyrazolyl) 2 (5-mesitylpyrazolyl) -(Tp Ms* ), HB(3mesitylpyrazolyl) 3 -(Tp Ms ), HB(3,5-Me 2 -pyrazolyl) 3 -(Τp * ), HB(pyrazolyl) 3 -(Tp), BuB(pyrazolyl) 3 -( Bu Tp)). The activity of Tp′TiX 3 /MAO varies in the order Tp Ms* TiCl 3 (10c) >
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