Preparation of phosphonic and/or phosphinic acids

US4069245A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Walter Dursch · Königstein, DE
• Hans-Jerg Kleiner · Kronberg, DE
• Horst-Dieter Thamm · Kelkheim, DE

Key dates

• Filing date: Aug 29, 1975
• Grant date: Jan 17, 1978
• Expiry date: Aug 29, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/30
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Preparation of phosphonic and/or phosphinic acids by hydrolytic cleavage of phosphonic and/or phosphinic acid alkyl esters in the presence of the phosphonic and/or phosphinic acid by carrying out the hydrolysis at a temperature of from 160.degree. to 250.degree. C with the use of at least a stoichiometric amount of water, and by distilling off the alkanol formed, optionally together with water.