Activation du zinc par le trimethylchlorosilane: Preparation d'alcools β-ethyleniques a partir de bromures α-ethyleniques, de derives carbonyles et de zinc dans l'ether

δ-ethylenic alcohols can be prepared in ether fron an α-ethylenic bromide, a carbonyl compound and zinc, provided the metal is previously activated by addition of a small amount of trimethyl-chlorosilane.