Various thiophenecarboxylates carrying a 2-trifluoromethyl, 2-(1,1-dif
luoroalkyl) or 2-polyfluoroalkyl group are synthesized conveniently fr
om reaction of alpha-fluoroalkyl ketones 1, aldehydes 2 or ethyl alpha
-fluoroalkylacetates 3 with methyl (or ethyl) 2-sulfanylacetates 4. A
possible reaction pathway is suggested.