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Issue 22, 2012
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Preparation and structures of aryloxy– and alkoxy–Ti(IV) complexes and their evaluation in ethylene oligomerisation and polymerisation

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Abstract

A range of aryloxy and alkoxy ligands, both monodenate and chelating, have been coordinated to Ti(IV) to yield complexes of the form [Ti(OAr)2Cl2], [Ti(RO⁁O)Cl3] and [Ti(RO⁁O)2Cl2] (R = aryl, alkyl). The complexes vary in their Lewis base solvation and/or aggregation state, as revealed by X-ray crystallography of selected examples. The complexes have been evaluated as catalysts for ethylene oligomerisation and polymerisation following activation with alkylaluminium reagents (AlEt3, methylaluminoxane). While polyethylene is the major product, 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. The findings are discussed in the context of the commercial Alphabutol dimerisation system [Ti(OR)4], and the development of group 4 based ethylene trimerisation catalysts.

Graphical abstract: Preparation and structures of aryloxy– and alkoxy–Ti(iv) complexes and their evaluation in ethylene oligomerisation and polymerisation

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Publication details

The article was received on 14 Sep 2011, accepted on 13 Dec 2011 and first published on 16 Jan 2012


Article type: Paper
DOI: 10.1039/C2DT11737A
Dalton Trans., 2012,41, 6625-6633

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    Preparation and structures of aryloxy– and alkoxy–Ti(IV) complexes and their evaluation in ethylene oligomerisation and polymerisation

    J. A. Suttil, D. S. McGuinness, M. Pichler, M. G. Gardiner, D. H. Morgan and S. J. Evans, Dalton Trans., 2012, 41, 6625
    DOI: 10.1039/C2DT11737A

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