Patent · US Expired

Process for the preparation of aromatic hydroxy carboxylic acids

US5643494A · kind A · utility

0Cited by

2References

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	Jun 1, 1995
Grant date	Jul 1, 1997
Priority date	—
Expiry date	Jun 1, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/10
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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.

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