Abstract Substituent effects on yields and regioselectivity of photochemical and thermal trifluoromethylation reactions of Te (CF 3) 2 with halogen benzenes and methyl benzenes are investigated under comparable conditions. All reactions lead to trifluoromethylated products. The yields of the thermal are always higher than those of the corresponding photochemical reactions. The reactivity of the halobenzenes increases in the series C 6 H ...
