Process for the manufacture of vinyl phosphonic acid derivatives

US4388252A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Walter Dursch · Königstein, DE
• Hans-Jerg Kleiner · Kronberg, DE

Key dates

• Filing date: Jan 12, 1981
• Grant date: Jun 14, 1983
• Expiry date: Jan 12, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/4015
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for the manufacture of vinyl phosphonic acid derivatives of the formula ##STR1## with R.sub.1 being hydrogen or alkyl with 1 to 4, preferably 1 to 2, carbon atoms and n being 1 or 2, which comprises heating to 150.degree.-270.degree. C., preferably 170.degree. to 230.degree. C., 2-acetoxyethane phosphonic acid dialkyl esters of the formula ##STR2## with R.sub.2 being alkyl with 1 to 4, preferably 1 to 2, carbon atoms, in the presence of acidic or basic catalysts.