The group 4 mixed-ligand compounds [CpM{NC 5 H 4 (CR 2 O)-2}Cl 2 ] (M = Ti; R = Pr i ( 1a ), Ph ( 1b ); M = Zr, R = Pr i ( 2a ), Ph ( 2b )) have been prepared and characterized. Single-crystal X-ray analyses reveal that 1a and 2b adopt four-legged piano-stool structures in which the cyclopentadienyl ligand is asymmetrically bonded and the pyridylalkoxide is bidentate. Toluene solutions of [CpM{NC 5 H 4 (CR 2 O)-2}Cl 2 ] and methylaluminoxane catalyze the polymerization of ethylene, generating high molecular weight polymers with narrow molecular weight distributions. The activity of the titanium- and zirconium-based catalysts are comparable.
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Doherty et al. (1998) studied this question.
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