text: Aside from its synthetic versatility (see above), sulfolene is used as an additive in electrochemical fluorination. It can increase the yield of perfluorooctanesulfonyl fluoride by about 70%. It is "highly soluble in anhydrous HF and increases the conductivity of the electrolyte solution". In this application, it undergoes a ring opening and is fluorinated to form perfluorobutanesulfonyl fluoride.