A Cp2TiCl2-Me3Al (1:4) reagent system: An efficient reagent for generation of allylic titanocene derivatives from vinyl halides, vinyl ethers and carboxylic esters

Article abstract of DOI:10.1016/S0040-4020(98)00681-4

The reagent prepared in advance by stirring a mixture of a Cp'2TiCl₂- Me₃Al (a 1:4 ratio) reagent system in toluene for 3 days is found to be effective in generating allylic titanocene on treatment with vinyl halides, vinyl ethers and carboxylic esters in THF. The process for the generation of an allylic titanocene species from these starting materials was suggested to proceed through a formation of titanacyclobutane and the subsequent elimination of the halogen or alkoxyl group. The generated allylic titanocene intermediate was proved to be an allylic Ti(IV) species and showed the typical reactivity to carbonyl compounds.