Perfluoroallyl iodide reacts readily with acid-washed cadmium powder in DMF at 0°C to give the F-allylcadmium reagent. Metathesis of F-allylcadmium with Cu(I)Br at -35° C in DMF gives the F-allylcopper reagent. With zinc powder, perfluoroallyl iodide affords mainly F-1,5-hexadiene. Only a low yield of F-allylzinc was detected. Both F-allylcadmium and F-allylcopper react with allyl bromide to yield 1,1,2,3,3-pentafluoro-1,5-hexadiene. © 1990.