METHOD OF PRODUCING OXAPERFLUOROALKANE SULPHONIC ACIDS AND SALTS THEREOF Russian patent published in 2014 - IPC C07C303/32 C07C309/10 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing oxaperfluoroalkane sulphonic acids and salts thereof of general formula C₂F₅O[CF₂CF(CF₃)O]_nCF₂CF₂SO₃R (1), where n = 0, 1 and R = H, alkali metal or ammonium cation, involving reaction of bromodifluoroacetyl fluoride with hexafluoropropylene oxide in a polar aprotic solvent to obtain a mixture of ω-bromo-oxaperfluoroacetyl fluorides of general formula BrCF₂CF₂O[CF(CF₃)CF₂O]_nCF(CF₃)COF, followed by decarbonylation thereof under the action of catalytic amounts of SbF₅ to form oxaperfluoroalkyl bromides C₂F₅O[CF₂CF(CF₃)O]_nCF₂CF₂Br, where n = 0, 1, further reductive sulphodioxidation of the obtained oxaperfluoroalkyl bromides under the action of either dithionites of alkali metals or under the action of zinc and sulphur dioxide in a polar aprotic solvent, chlorination of the reaction mixture and alkaline hydrolysis of the obtained compounds to salts of oxaperfluoroalkane sulphonic acids and separation of said oxaperfluoroalkane sulphonic acids from salts thereof by reacting the latter with sulphuric acid with separation of hydrates of oxaperfluoroalkane sulphonic acids and subsequent dehydration thereof with thionyl chloride.

EFFECT: method of producing oxaperfluoroalkane sulphonic acids and salts thereof, which avoids use of explosive and aggressive reagents.

3 cl, 10 ex