Published in
Elsevier, Journal of Organometallic Chemistry, 4(690), p. 874-884, 2005
DOI: 10.1016/j.jorganchem.2004.10.030
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Titanium and zirconium ketimide complexes: Synthesis and ethylene polymerisation catalysis
,
M. Mercês Marques,
M. Mercês Marques,
José R. Ascenso,
Alberto R. Dias,
M. Teresa Duarte ,
M. Teresa Duarte,
Anabela C. Fernandes,
Susete Fernandes,
M. João Ferreira,
Inês Matos,
M. Conceição Oliveira,
Sandra S. Rodrigues,
Claire Wilson
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Abstract
The syntheses of ketimide titanium complexes of the type Ti(NCtBu2)3X (X=Cl, Cp, Ind), Ti(NCtBu2)4 and the zirconium complex CpZr(NCtBu2)2Cl are described. When activated by MAO, all compounds are ethylene polymerisation catalysts. In the conditions studied, the most active catalyst is CpZr(NCtBu2)2Cl, with an activity of 2.7×105 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(NCtBu2)3X (X=Cl, Cp, Ind) and Ti(NCtBu2)4 were determined by X-ray single crystal diffraction.