Figure 3: Mechanism studies.

(a) Synthesis of CF₃I via decarboxylative coupling of I₂ with TFA. (b) Capture of CF₃ radical by TEMPO. (c) Determination of CF₃H and C₂F₆ side products in trifluoromethylation of caffeine. (d) Determination of H₂ and CO₂ from the photo-driven decarboxylation of TFA. (e) The proposed reaction mechanism.