In this HOT article, several new Ti(IV) complexes bearing aryloxy or alkoxy ligands have been prepared and evaluated as catalysts for the oligomerization/polymerization of ethylene. Obviously, polyethylene is the major product but ethylene oligomers also result, ranging from dimers to higher oligomers. The results indicate a number of different active species are formed upon activation, with oligomers likely arising through a metallacyclic mechanism.
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Preparation and structures of aryloxy- and alkoxy-Ti(IV) complexes and their evaluation in ethylene oligomerisation and polymerisation
James A. Suttil, David S. McGuinness, Markus Pichler, Michael G. Gardiner, David H. Morgan and Stephen J. Evans
Dalton Trans., 2012, Advance Article
See also the authors previous work providing further evidence for metallocyclic mechanisms at work at: