2, 4, 5, 6-Tetraflucro-1, 3-phenylenediamine has been prepared by the electrochemical reduction of 1-amino-3-iminoheptafluorocyclohex-1-ene at a mercury cathode. Similarly, by reduction of other amino-imino-fluorocyclohex-1-enes and aminoheptafluorocyclohexenones, 2-trifluoromethyl-4, 5, 6-trifluoro-1, 3-phenylenediamine, 1-amino-2, 4, 5, 6-tetrafluorophenol, and 1-isopropylamino-2, 4, 5, 6-tetrafluorophenol ...