Patent · US Expired

Process for the preparation of 2-amino-3-chlorobenzoic acid

US5233083A · kind A · utility

0Cited by

3References

12Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Theodor Papenfuhs · Frankfurt, DE
Jochen Rapp · Frankfurt, DE

Key dates

Filing date	Aug 13, 1992
Grant date	Aug 3, 1993
Priority date	—
Expiry date	Aug 13, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C227/08
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to a process for the preparation of 2-amino-3-chlorobenzoic acid by dissolving 1 mol of 2,3-dichlorobenzoic acid in about 400 to about 2000 parts of water with at least the equimolar amount of an alkali metal hydroxide or with an aqueous solution of the equimolar amount of an alkali metal hydroxide, and subsequently reacting it with about 500 to about 2500 mol % of ammonia at temperatures of about 150.degree. to about 220.degree. C. in the presence of copper bronze, copper(I) salts and/or copper(II) salts.

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