Process for the preparation of monohydroperfluoroalkane-sulfonic acid halides and some specific representatives of this class of compound

摘要

Monohydroperfluoroalkanesulfonic acid halides of the formula I ##STR1## in which R.sub.f =F or perfluoroalkyl, X=Cl or F and n=1-7, are prepared by reacting monohydroperfluoroalkanesulfonic acids of the formula II ##STR2## in which R.sub.f and n have the same meaning as in formula I, with pyrocatechol-phosphorus trichloride (compounds I in which X=Cl) and, if desired, further reacting the products with alkali metal fluorides and/or alkali metal hydrogen fluorides (compounds I in which X=F). With the exception of the compound in which R.sub.f =F, n=1 and X=Cl (HCF. sub.2 --CF.sub.2 --SO.sub.2 Cl), the compounds I are new.PPThe compounds I are chiefly intermediates in organic fluorine chemistry, in particular for the preparation of perfluorinated ion exchanger resins containing sulfonic acid groups.