C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
260/464.3, 204/5
C25B 3/02 (2006.01)
Patent
CA 1163646
HOE 80/F 196 Abstract: .omega.-Fluorosulfato-perfluorocarboxylic acid derivatives and a process for their preparation New perfluorinated .omega.-fluorosulfato compounds, that is to say .omega.-fluorosulfato-perfluorocarboxylic acid derivatives of the formula I Image (I) in which A denotes halogen, preferably C1 or F, and in particular F, or the group OR (R = alkyl, aryl or aralkyl with preferably up to 10 C atoms, in particular CH3 or C2H5), m denotes a number from 1 to 10, preferably from 1 to 8 and in particular from 1 to 6, and n denotes a number from 0 to 10, preferably from 0 to 4 and in par- ticular 0 or 1, are prepared by electrolysis of .omega.-H- perfluorocarboxylic acid halides of the formula II Image (II) in which A' = halogen and m and n have the same meaning as in formula I, in an electrolyte consisting of fluoro- sulfonic acid/alkali metal fluorosulfonate, the compounds of the formula III being formed: Image (III) in which A' has the same meaning as in formula II and m and n have the same meaning as in formulae I and II, these compounds then also being esterified with an organic hydroxy compound of the formula IV ROH (IV) in which R has the meaning given in the case of formula I, to give compounds I in which A = OR. The compounds I are valuable intermediate pro- ducts, in particular for the preparation of perfluorinated vinyl compounds with a further functional group; the vinyl compounds can in turn be processed to valuable oligomers and polymers which are very stable to heat and chemicals and can be used in many ways.
385689
Millauer Hans
Schwertfeger Werner
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Hoechst Aktiengesellschaft
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