C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
260/464.3
C25B 3/00 (2006.01)
Patent
CA 1206161
- 1 - Abstract of the disclosure: .omega.-Fluorosulfatoperfluoroalkanoic acid derivatives of the formula VII FSO2-O-CF2-Rf-COY (VII) in which Rf is a single bond or an unbranched or branched perfluoroalkylene radical preferably containing 1 - 10, and especially 2 - 8, C atoms, and Y is F or OR (R is an alkyl radical preferably containing 1 - 10 C atoms, in particular CH3 or C2H5), are prepared starting From .alpha.,.omega.- bis-fluorosulfatoperfluoroalkanes of the formula VIII FSO2-O-CF2-Rf-CF2-O-SO2F (VIII) in which Rf has the same meaning as in formula VII. The compounds of the formula VII in which Y is F are obtained by the decomposition of the starting com- pounds VIII in the presence of catalytic amounts of at least one alkali metal fluoride and/or alkali metal hydro- gen fluoride at temperatures between about -30 and +150°C, with continuous removal of the compounds VII in which Y is F formed in this reaction. The compounds of the formula VII in which Y is OR are obtained by reacting the starting compounds VIII with catalytic to approximately equimolar quantities of at least one alkali metal fluoride and/or alkali metal hydro- gen fluoride, and in the presence of an at least approxi- mately equimolar amount of an alcohol of the formula IX - 2- in which R has the meaning mentioned for formula VII, and, if appropriate, also in the presence of an inert diluent which does not dissolve the alkali metal fluorides and/or alkali Metal hydrogen fluorides, until an amount of sul- furyl fluoride which is approximately equimolar in rela- tion to the amount of the starting compound VIII has been liberated. The compounds VII are valuable intermediate pro- ducts, in particular for the preparation of perfluorina- ted vinyl ethers which still contain an ester group at the other end of the molecule; these are in turn important monomers for copolymerization with tetrafluoroethylene and other fluoroolefines for the purpose of producing ion-selective membranes, cation exchange compositions and fluorocarbon elastomers.
407312
Schwertfeger Werner
Siegemund Gunter
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Clariant Gmbh
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