Power-variable trifluoromethylating agents, (trifluoromethyl)dibenzothio- and -selenophenium salt system

(Trifluoromethyl)dibenzothio- and -selenophenium triflates and their nitro derivatives differing in trifluoromethylating power were developed as a new system of electrophilic trifluoromethylating agents. Graphic