Process for making vinylphosphonic acid or vinylpyrophosphonic acid

US4486357A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Werner Krause · Plantsville, US
• Werner Pieper · Kerpen, DE

Key dates

• Filing date: Feb 21, 1984
• Grant date: Dec 4, 1984
• Expiry date: Feb 21, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/3895
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The disclosure relates to process for making derivatives of vinylphosphonic acid or vinylpyrophosphonic acid. To this end, a ketone is reacted with tetraphosphorus hexoxide in the presence of catalytic proportions of a proton-yielding substance. In the event of the products desired to be produced being vinylphosphonic acid derivatives, the vinylpyrophosphonic acid derivatives first obtained are hydrolyzed with an equivalent quantity of water.