SYNTHESIS OF POLYFLUORINATED CYCLOHEXADIE NES BY THE ELECTROCHEMICAL FLUORINATION OF POLYFLUOROBENZENES

Electrochemical fluorination of tetra-, penta- and hexa-fluorobenzenes was carried out at platinum anode at 2.5 V [vs. Ag+(0.01 mol/dm3)/Ag] in (C2H5)4NF 4.35HF electrolyte. Most amounts of the substrates were consumed when the electrolytic currents almost fell to the background current value at 2.1-2.3 F/mol passed. The major products were cyclohe xadienes produced by 1,4- and 1,2-additions of two fluoride anions to the substrates. All the cyclohexadienes obtained thus far was both ele ctrochemically and chemically stable in the electrolysis conditions.