Process for the preparation of aromatic compounds by decarboxyla

Details Process for the preparation of aromatic compounds by decarboxyla Process for the preparation of aromatic compounds by decarboxyla

1996-05-02

1998-04-14

Barts, Samuel

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

562474, 570127, C07C 5138

Patent

active

057393885

ABSTRACT:
The present invention relates to a process for the preparation of compounds of the formula ##STR1## in which the radicals R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are identical or different and are COOH, H, F, Cl, Br, CF.sub.3, OH, an alkoxy or alkyl radical having in each case 1 to 4 carbon atoms or a radical --NR.sup.6 R.sup.7, in which R.sup.6 and R.sup.7 are identical 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 ##STR2## in which the radicals R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 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.degree. to 210.degree. 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 decarboxylation catalyst.

REFERENCES:
patent: 5329054 (1994-07-01), Theriot

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