Process for preparing perfluoroalkoxysulphonic compounds

• Main Authors: MONTANARI; VITTORIO, STACCIONE; ANNA M, NAVARRINI; WALTER
• Format: Patent
• Language: English
• Published: 20.12.1994
• Edition: 5
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES; BASIC ELECTRIC ELEMENTS; CANDLES; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; DETERGENT COMPOSITIONS; DETERGENTS; ELECTRICITY; FATTY ACIDS THEREFROM; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; RECOVERY OF GLYCEROL; RESIN SOAPS; SOAP OR SOAP-MAKING; THEIR RELEVANT APPARATUS; TRANSPORTING; USE OF SINGLE SUBSTANCES AS DETERGENTS

This invention relates to a process for preparing perfluoroalkoxysulphonic compounds having formula: Rf(OC2F4SO2X)p (I) wherein Rf represents a perfluoroalkyl or perfluoroethereal group, X represents F, OH or OM, in which M is an alkaline cation, an alkaline-earth cation, or X represents NR1R2, in which R1 and R2, independently of each other, represent H or an alkyl group containing from 1 to 5 carbon atoms and p is a number selected from 1 to 2, characterized in that the perfluoro vinyl sulphonyl fluoride of formula (II) CF2=CF-SO2F is reacted with a hypofluorite of formula (III): Rf(OF)r (III) wherein Rf is the same as defined above, and r represents 1 or 2, optionally in an inert solvent, at a temperature approximately ranging from -140 DEG C. to +40 DEG C., and in that, if so desired, from the compound of formula (I) so obtained in which X=F, the corresponding derivatives, in which X has the other meaning as defined above, are obtained by means of conventional techniques.