Process for preparing aromatic hydroxycarboxylic acids

Details Process for preparing aromatic hydroxycarboxylic acids Process for preparing aromatic hydroxycarboxylic acids

1994-05-19

1996-07-02

Shippen, Michael L.

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

Organic compounds

Carboxylic acids and salts thereof

562425, C07C 5115

Patent

active

055324061

ABSTRACT:
A process for preparing aromatic hydroxycarboxylic acids or di-salts thereof by reaction of alkali metal phenolates or naphtholates with carbon dioxide, in the presence or absence of a further alkali metal salt, which comprises introducing the solid phenolate or naphtholate starting materials and, if desired, the alkali metal salt into the reaction mixture batchwise or continuously, separately or together, in the form of a dispersion in an inert organic liquid.
The process of the invention makes possible the preparation of aromatic hydroxycarboxylic acids in good yields and with high chemical selectivity. Additional measures for increasing the selectivity, as are described for the Kolbe-Schmitt reaction in, for example, EP-A 0 053 824, EP-A 0 081 753 and EP-A 0 254 596, can be omitted.

REFERENCES:
patent: 1593816 (1926-07-01), Andre
patent: 3816521 (1974-06-01), Ueno
patent: 4239913 (1980-12-01), Ueno
patent: 4287357 (1981-09-01), Mueller et al.
patent: 4329494 (1982-05-01), Montgomery
patent: 4966992 (1990-10-01), Ueno
patent: 5072036 (1991-12-01), Suzuki
Patent Abstracts of Japan, vol. 6, No. 223 (C-133) (1101), published Nov. 9, 1982.
Patent Abstracts of Japan, vol. 11, No. 273 (C-445) (2720), published Sep. 4, 1987.

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