Abstract
The sulfur-linked bis(phenol) 2,2′-thiobis(2- tert-butyl-4-methylphenol), tbmpH 2, reacted cleanly with titanium tetrachloride to give the orange titanium dichloro complex [Ti(tbmp)Cl 2] 2 in virtually quantitative yield. Reaction of the dichloro complex [Ti(tbmp)Cl 2] 2 with methyllithium at low temperature gave the unexpectedly thermally robust, yellow dimethyl complex [Ti(tbmp)Me 2]. The reaction of the dichloro complex with benzyl Grignard reagent in pentane afforded the highly crystalline dibenzyl complex [Ti(tbmp)(CH 2Ph) 2] as a 1,4-dioxane adduct. The single crystal X-ray crystallography revealed a centrosymmetric 1,4-dioxane-bridged molecule that contains two fragments containing six-coordinate titanium centers with the tridentate tbmp ligand in a facial fashion and two η 1-benzyl ligands. When [Ti(tbmp)Me 2] was activated with B(C 6F 5) 3 in toluene, ethylene was polymerized.
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