337509-01-0Relevant articles and documents
2-tert-Butyl and 2-phenylphenylimido complexes of titanium(IV) and their olefin polymerisation activity
Nielson, Alastair J.,Glenny, Mark W.,Rickard, Clifton E. F.
, p. 232 - 239 (2001)
Reaction of 7 equivalents of tert-butylamine with TiCl4 in hexane at 0 °C gave [TiCl2(NCMe3)(NH2CMe3)2 ]2 1 which on thermalisation with 2,6-diisopropylaniline in toluene gave [TiCl2(NC6H3Pri2- 2,6)(NH2CMe32]x 2. Imido exchange of [TiCl2(NCMe3)(NH2CMe3)] x. with o-toluidine or 2-tert-butylaniline and addition ofpyridine gave [TiCl2(NC6H4- Me-2)(py)3] and [TiCl2(NC6H4CMe3-2)(py)] 3] which crystallised to give [TiCl2(NC6H4Me-2)(py)2] 2 3 and [TiCl2-(NC6H4CMe3-2)(py) 2]2 4. 2-Phenylaniline and [TiCl2(NCMe3)(py)3] gave [TiCl2(NC6H4Ph-2)(py)2] 2 5 on crystallisation and reaction of (tert-butylaniline or 2-phenylaniline with [TiCl2(NCMe3)(tmeda)] gave [TiCl2(6H4CMe3-2)(tmeda)] 6 and [TiCl2(6H4Ph-2)(tmeda)]2 7. Complexes 1, 3, 4, 5, 6, and 7 were characterised by X-ray crystallography and the possibility of imdo ligand C-N bond rotation taking place analysed and compared with the NMR spectra. [TiCl2(NCMe3)(tmeda)] and MAO·(MeAlO)n, polymerises ethylene at low pressure with low activity (3.2 g mmol-1 h-1 bar-1), [TiCl2(6H4CMe3)(tmeda)] or [TiCl2(NC6H4Ph-2)(tmeda)] and MAO gives a 4-fold increase in activity whereas propene is not polymerised but 1-hexene is. Heterogenisation by addition of [TiCl2(NCMe3)(NH2CMe3)2]2 1 to tmeda-functionalised crosslinked polystyrene or imido exchange of [TiCl2(NCMe3)(tmeda)] with NH2- functionalised crosslinked polystyrene gives supported complexes which do not polymerise ethylene at low pressure in the presence of MAO. The Royal Society of Chemistry 2001.