C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 63/70 (2006.01) C07C 17/363 (2006.01) C07C 25/13 (2006.01) C07C 51/38 (2006.01) C07C 65/03 (2006.01) C07C 65/21 (2006.01) C07C 209/68 (2006.01) C07C 211/44 (2006.01)
Patent
CA 2175535
The present invention relates to a process for the preparation of compounds of the formula Image (1) in which the radicals R1, R2, R3, R4 and R5 are identical or different and are COOH, H, F, Cl, Br, CF3, OH, an alkoxy or alkyl radical having in each case 1 to 4 carbon atoms or a radical -NR6R7, in which R6 and R7 are identi- cal or different and are H, an alkyl radical having 1 to 4 carbon atoms or a phenyl radical, by dissolving in water a compound of the formula Image (2) in which the radicals R1, R2, R3, R4 and R5 are identical or different and have the abovementioned meaning or, in departure therefrom, instead of H can be COOH, admixing the aqueous solution with a water-insoluble amine which is inert under the reaction conditions and carrying out the decarboxylation at a pH of 3 to 9 and a temperature of 70 to 210°C in the presence or absence of a water- insoluble solvent which is inert under the reaction conditions and in the presence or absence of a decarb- oxylation catalyst.
Pfirmann Ralf
Schubert Hans
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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