Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Fluorinated olefins like tetrafluoroethylene or hexafluoropropene react with electrochemically produced peroxydisulfuryldifluoride in fluorosulfonic acid to form oligomeric bisfluorosulfates of formulas I and II. ... The composition of I and II has been determined. In addition, the ...