Patent · US Expired

Process for the preparation of 2-hydroxynaphthalene-6-carboxylic acid

US5808142A · kind A · utility

1Cited by

8References

4Claims

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	Sep 13, 1994
Grant date	Sep 15, 1998
Priority date	—
Expiry date	Sep 13, 2014

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/38
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for the preparation of 2-hydroxynaphthalene-6-carboxylic acid using potassium carbonate and CO at temperatures above 260.degree. C. and at a pressure of at least 10 bar comprises using 2-hydroxynaphthalene-3-carboxylic acid and/or 2-hydroxynaphthalene-3,6-dicarboxylic acid and/or their potassium salts and, if desired, potassium .beta.-naphtholate as starting materials. The process according to the invention enables a considerable increase, by reusing the secondary products, in the product selectivity with regard to 2-hydroxy-naphthalene-6-carboxylic acid.

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