Abstract The trifluoromethylation reactions of Cd (CF 3) 2· glyme, Hg (CF 3) 2, Sb (CF 3) 3, CF 3 I, and Te (CF 3) 2 with furan, thiophene, pyrrol, and p-benzoquinone are compared under similar conditions. During the photochemical reactions the reactivity increases in the series Cd (CF 3) 2· glyme< Hg (CF 3) 2< Sb (CF 3) 3< CF 3 I< Te (CF 3) 2. Cd (Cf 3) 2 complexes do not react to form trifluormethylated compounds either by photóchemical or ...