P-position of a, P-conjugated olefinic systems.'The trapping of the anionic intermediate 1 with electrophiles2 other than alkylating agents3 has also been shown in some syntheses. The organocopper reagents, however, are not necessarily simple in their preparation and operation. W e wish to report a novel zinc-promoted joining reacti~ n~.~ of three components consisting of alkyl halides 2, activated olefins 3, and carbonyl compounds 4. This one-step ...
