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The synthesis, structure and ethene polymerisation catalysis of mono(salicylaldimmato) titanium and zirconium complexes

Lookup NU author(s): Professor William Clegg, Dr Ross Harrington

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Abstract

The siryl ethers 3-But-2-(OSiMe3)C6H 3CH=NR (2a-e) have been prepared by deprotonation of the known iminophenols (1a-e) and treatment with SiClMe3 (a, R = C 6H5; b, R = 2,6-Pr2iC 6H3; c, R = 2,4,6-Me3C6H 2; d, R = 2-C6H5C6H4; e, R = C6F5). 2a-c react with TiCl4 in hydrocarbon solvents to give the binuclear complexes [Ti{3-Bu1-2-(O)C 6H3CH=N(R)}Cl(μ-Cl3)TiCl3] (3a-c). The pentafluorophenyl species 2e reacts with TiCl4 to give the known complex Ti{3-But-2-(O)C6H3CH=N(R)} 2Cl2. The mononuclear five-coordinate complex, Ti{3-But-2-(O)C6H3CH= N(2,4,6-Me 3C6H2)}Cl3 (4c), was isolated after repeated recrystallisation of 3c. Performing the dehalosilylation reaction in the presence of tetrahydrofuran yields the octahedral, mononuclear complexes Ti{3-But-2-(O)C6H3CH= N(R)}Cl3(THF) (5a-e). The reaction with ZrCl4(THF), proceeds similarly to give complexes Zr{3-But-2-(O)-C6H3CH=N(R)}Cl 3(THF) (6b-e). The crystal structures of 3b, 4c, 5a, 5c, 5e, 6b, 6d, 6e and the salicylaldehyde titanium complex Ti{3-But-2-(O)C 6H3CH=O}Cl3(THF) (7) have been determined. Activation of complexes 5a-e and 6b-e with MAO in an ethene saturated toluene solution gives polyethylene with at best high activity depending on the inline substituent.

Publication metadata

Author(s): Pennington DA, Clegg W, Coles SJ, Harrington RW, Hursthouse MB, Hughes DL, Light ME, Schormann M, Bochmann M, Lancaster SJ

Publication type: Article

Publication status: Published

Journal: Dalton Transactions

Year: 2005

Issue: 3

Pages: 561-571

ISSN (print): 1477-9226

ISSN (electronic): 1477-9234

Publisher: Royal Society of Chemistry

URL: http://dx.doi.org/10.1039/b414229b

DOI: 10.1039/b414229b

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