Titanium Complexes Stabilized by a Sulfur-Bridged Chelating Bis(aryloxo) Ligand as Active Catalysts for Olefin Polymerization
✍ Scribed by Zofia Janas; Lucjan B. Jerzykiewicz; Katarzyna Przybylak; Piotr Sobota; Krzysztof Szczegot
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 155 KB
- Volume
- 2004
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Abstract
The mixed‐ligand complexes [Ti~2~(μ‐OR)~2~(OR)~2~(κ^3^‐tbop)~2~] (1a) for R = Me and (1b) R = Et were prepared by the reaction of Ti(OR)~4~ and H~2~tbop {H~2~tbop = 2,2′‐thiobis[4‐(1,1,3,3‐tetramethylbutyl)phenol]} in methanol. Treatment of 1a and 1b with AlMe~3~ led to the substitution of terminal alkoxy groups to create the organometallic compounds [Ti~2~(μ‐OR)~2~(κ^3^‐tbop)~2~(Me)~2~] (2a) for R = Me and (2b) for R = Et. Controlled hydrolysis of 2b causes the evolution of methane and the formation of the titanoxane compounds [{Ti~2~(μ‐OEt)~2~(κ^3^‐tbop)~2~}~2~(μ‐O)~2~]·2CH~2~Cl~2~ (3). Structures of 1a, 1b, 2a, 2b, and 3 were confirmed by NMR spectroscopy; 1b and 3 were further investigated with X‐ray crystallography. Compounds 1a, 1b, 2a, and 2b were supported on MgCl~2~ and when activated with aluminum alkyls, found to effectively polymerize ethylene. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)