PROCESS FOR THE PREPARATION OF PERFLUOROCARBONYLSULFONIC ACID FLUORIDES, THE FLUOROSULFATOPERFLUOROALKANESULFONIC ACID HALIDES THEREBY FORMED AS INTERMEDIATES, AND SOME SPECIFIC PERFLUOROCARBONYLSULFONIC ACID FLUORIDES

摘要

of the disclosure: Perfluorocarbonylsulfonic acid fluorides of the formula I (I) in which Rf denotes F or perfluoroalkyl and n denotes a number from 0 to 7 are prepared by electrolysis of monohydroperfluoroalkanesulfonic acid halides of the formula II (II) in which Rf and n have the same meaning as in formula I and X is chlorine or fluorine, preferably fluorine, in an electrolyte consisting of fluorosulfonic acid/alkali metal fluorosulfonate, using glassy carbon as the anode material, and treatment of the fluorosulfatoperfluoroalkanesulfonic acid halides thereby formed, of the formula III (III) in which Rf, X and n have the same meaning as in the formulae I and II, with catalytic to equimolar (if X=F), and additionally at least further equimolar (if X=Cl) amounts of an alkali metal fluoride. The fluorosulfatoperfluoroalkanesulfonic acid halides III thereby formed as intermediates, and those perfluorocarbonylsulfonic acid fluorides I in which n = a number from 2 to 7 are new. The compounds I are chiefly intermediates for the preparation of perfluorinated ion exchanger resins.