| abstract |
(57) Abstract: Disadvantages of prior art processes that can be used for a wide range of aromatic carboxylic acids, such as the complex processing steps of the resulting reaction mixture, the use of high temperatures and long reaction times, and corrosive aqueous solutions. To develop a method that can avoid the use of. SOLUTION: The formula: [Wherein the groups R 1 , R 2 , R 3 , R 4 and R 5 are COOH, H, F, Cl, Br, CF 3 , OH, an alkoxy or alkyl group or a group -NR 6 R 7 each having 1 to 4 carbon atoms (wherein R 6 And R 7 is H, which is an alkyl group having 1 to 4 carbon atoms or a phenyl group), and is represented by the formula: [Wherein the groups R 1 , R 2 , R 3 , R 4 and R 5 have the meanings given above or, apart from these meanings, may be COOH instead of H]. And mixing the aqueous solution with a water-insoluble amine and in the presence or absence of a water-insoluble solvent and in the presence or absence of a decarboxylation catalyst, a pH of 3-9 and 70-210. A method as described above, which comprises carrying out decarboxylation at a temperature of ° C. |