Process for the preparation of aromatic hydroxy carboxylic acids

Details Process for the preparation of aromatic hydroxy carboxylic acids Process for the preparation of aromatic hydroxy carboxylic acids

1995-06-01

1997-07-01

Killos, Paul J.

Compositions

Compositions containing a single chemical reactant or plural...

Organic reactant

562424, C09K 300

Patent

active

056434944

ABSTRACT:
A process for the preparation of aromatic hydroxy carboxylic acids by reacting alkali metal phenolates or alkali metal naphtholates with alkali metal carbonates and carbon monoxide, with subsequent acidification, wherein the solid starting materials--alkali metal carbonate and/or alkali metal phenolate or naphtholate--are metered into the reaction mixture in the form of one or more dispersions in an inert organic liquid.
The process according to the invention enables the preparation of aromatic hydroxy carboxylic acids in good yields and with high chemical selectivity. Additional measures for increasing the selectivity, as described for example for the Kolbe-Schmitt reaction in EP-A 0 053 824, EP-A 0 081 753 and EP-A 0 254 596, and for the reaction with CO and carbonate in, for example, WO 91/11422, are unnecessary.

REFERENCES:
patent: 3655744 (1972-04-01), Yasuhara et al.
patent: 4966992 (1990-10-01), Ueno et al.
Patent Abstracts of Japan, vol. 6, No. 223 (C-133) (1101), Nov. 9, 1982.

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