Process for the preparation of vinyldiphosphonic acid and salts thereof

US4828766A · kind A · utility

Assignee

• Benckiser-Knapsack GmbH · DE

Inventors

• Stephan Kleemann · Schriesheim, DE
• Werner Ehret · Wilhelmsfeld, DE

Key dates

• Filing date: Jun 30, 1987
• Grant date: May 9, 1989
• Expiry date: Jun 30, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/3847
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An improved process for the preparation of vinyldiphosphonic acid is disclosed. The process involves elimination of a volatile acid from a 1-(O-acyl)-ethane-1,1-diphosphonic acid. The starting materials may be prepared by reacting 1-hydroxyethane-1,1-diphosphonic acid with the corresponding acid or directly by reacting the acid with phosphorous acid and an acyl anhydride.