A　new　method　for　the　synthesis　of　trifluoromethylated　acetylenes　is　developed　which　involves　the　copper-catalyzed　trifluoromethylation　of　alkynyltrifluoroborates　with　an　electrophilic　trifluoromethylating　reagent.　This　method　offers　significant　advantages　such　as　efficiency　and　mild　and　base-free　reaction　conditions.　A　plausible　mechanism　is　proposed.　(c)　2012　Published　by　Elsevier　Ltd.