Process for the preparation of halogenated acrylic acids

Details Process for the preparation of halogenated acrylic acids Process for the preparation of halogenated acrylic acids

C - Chemistry, Metallurgy

25

B

C25B 3/06 (2006.01) C25B 3/04 (2006.01)

Patent

CA 2092693

WO 92/05299 PCT/EP91/0173B - 15 - Abstract Process for the preparation of halogenated acrylic acids Process for the preparation of compounds of the formula (I) Image (I) by electrolytic reduction. R1 is a fluorine atom or a methyl or deuteromethyl group; R2 and R3 are identical or different and are a fluorine, chlorine, hydrogen or deuterium atom; R4 is a Image group, in which R5 is -OH, -OD, C1-C4-alkoxy or -OMe, where Me = alkali metal, alkaline earth metal or NH4 ion. A compound of the formula (II) (II) Image or a compound of the formula (III) (III) Image (R1, R2, R3 and R4 have the abovementioned meaning; R6 is a chlorine atom) is subjected to electrolysis in an - 16 - undivided or divided cell in an electrolysis liquid in the presence of iron salts, which are present in the electrolyte in a concentration of 1 to 500 ppm,

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