Process for the preparation of alkali metal phosphonoformates

US4966991A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventor

• Thomas Gerdau · Eppstein, DE

Key dates

• Filing date: Jul 1, 1988
• Grant date: Oct 30, 1990
• Expiry date: Jul 1, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/3886
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the production of alkali-phosphonoformates which comprises bringing together in a first stage a trialkyl ester of phosphonoformic acid and an aqueous solution of an alkali hydroxide at a temperature in the range from the freezing point of water and about 40.degree. C., either keeping the resulting mixture in a second stage for further progress of the reaction and then heating the reaction mixture in a third stage to a temperature up to about 100.degree. C. for completion of the saponification, or heating the reaction mixture immediately for completion of the saponification to a temperature of up to 100.degree. C.