Patent · US Expired

Process for preparing aromatic hydroxycarboxylic acids

US5532406A · kind A · utility

1Cited by

7References

20Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Siegbert Rittner · Mörfelden, DE
Hans-Martin Ruffer · Hofheim, DE
Jorg Schmid · Hürth, DE
Thomas Wisser · Limburg, DE

Key dates

Filing date	May 19, 1994
Grant date	Jul 2, 1996
Priority date	—
Expiry date	May 19, 2014

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/15
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.