The palladium (o) catalyzed coupling of acyl halides or anhydrides with alkenyl copper reagents furnishes α, β ethylenic ketones and α, β-α, β'diethylenic ketones in high yield. The substitution pattern of the alkenyl copper reagent, directly obtained by carbocupration of alkynes, is fully retained. Anhydrides of Z-ethylenic acids also retain their Z stereochemistry. β-halogeno-vinyl ketones react under the above conditions to afford α, β-γ, δ dienones. An ...
