A　facile　preparation　of　allylic　trifluoromethyl　thioethers　was　achieved　by　using　a　copper　reagent.　The　reaction　of　(bpy)Cu(SCF3)　with　various　allylic　bromides　afforded　the　desired　trifluoromethylthiolation　products　in　good　to　excellent　yields　with　high　stereo-　and　regioselectivity.　Common　functional　groups　such　as　alkyl,　alkoxy,　trifluoromethyl,　nitro,　halides　and　geranyl　are　well　tolerated.