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Dias, Alberto R.
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article
Titanium and zirconium ketimide complexes
Abstract
<p>The syntheses of ketimide titanium complexes of the type Ti(N=C <sup>t</sup>Bu<sub>2</sub>)<sub>3</sub>X (X = Cl, Cp, Ind), Ti(N=C <sup>t</sup>Bu<sub>2</sub>)<sub>4</sub> and the zirconium complex CpZr(N=C <sup>t</sup>Bu<sub>2</sub>)<sub>2</sub>Cl are described. When activated by MAO, all compounds are ethylene polymerisation catalysts. In the conditions studied, the most active catalyst is CpZr(N=C<sup>t</sup>Bu<sub>2</sub>)<sub>2</sub>Cl, with an activity of 2.7 × 10<sup>5</sup> kg/(molZr [E] h). Titanium complexes are less active by about two orders of magnitude. The polyethylene produced is linear, as determined by NMR spectroscopy. Molecular structures of Ti(N=C<sup>t</sup>Bu<sub>2</sub>)<sub>3</sub>X (X = Cl, Cp, Ind) and Ti(N=C <sup>t</sup>Bu<sub>2</sub>)<sub>4</sub> were determined by X-ray single crystal diffraction.</p>