Highly stereospecific palladium-catalysed vinylation of vinylic halides under solid-liquid phase transfer conditions.

(E,E) and (E,Z) conjugated dienoates, dienones and dienals are obtained with high stereospecificity (?95%) and in high yields from the corresponding (E) and (Z) vinylic halides and vinylic substrates (methyl acrylate, methyl vinyl ketone or acrolein), in the presence of potassium carbonate, tetrabutylammonium chloride and a catalytic amount of palladium acetate, in N,N-dimethylformamide at room temperature.