Preparation of Dialkoxyborylbis-(bromozincio)methane and Its Reaction with Electrophiles

Dialkoxyborylbis(bromozincio)methane was prepared from dialkoxyboryldibromomethane by the Pb-catalyzed reaction with zinc. The dialkoxyborylbis(bromozincio)methane afforded vinylboranes by TiCl-mediated reaction with aldehydes or ketones. The reagent also coupled doubly with an equivalent organic halide under an influence of transition metal salts.