Titanocene-catalyzed reaction of alkenes and dienes with alkyl halides andchlorosilanes

New catalytic reactions for regioselective introduction of alkyl and/or sil yl functionalities to alkenes and dienes are described. These reactions pro ceed efficiently under mild conditions by the use of Cp2TiCl2 as a catalyst in the presence of Grignard reagents. The present study would provide a pr ototype for the practical use of alkyl halides and chlorosilanes in transit ion metal-catalyzed reactions. In these reactions, ate complexes of titanoc ene play important roles as the active species. The scope and limitations. as well as reaction pathways, are discussed.