General procedure of Synthesis of Aryl Tetrafluoro-λ 6 -sulfanyl Chlorides Trichloroisocyanuric acid (18.0 equiv.) was added to an oven-dried round bottom flask charged with a stir bar under glovebox atmosphere. Then, spray-dried potassium fluoride (32.0 equiv.) was added, followed by the disulfide starting material (1.0 equiv.). Acetonitrile was added to the reaction flask followed by a solution of trifluoroacetic acid (0.1 equiv.) in acetonitrile. The reaction was stirred under glovebox atmosphere at room temperature (ca. 23 °C) for 18 h. Upon completion of the reaction, TCICA and KF were removed by filtration of the solvent through a PTFE syringe filter into a PFA vessel; the solvent was then removed in vacuo. The left-over white solids were extracted with n-pentane (or hexanes), filtered through a PTFE syringe filter into a PFA vessel and concentrated in vacuo.