Preparation of O, O-dimethyl-O-(2,2-dichlorovinyl)-thionophosphoric acid ester

US4123478A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Reimer Colln · Wuppertal, DE
• Wilhelm Sirrenberg

Key dates

• Filing date: Jul 29, 1977
• Grant date: Oct 31, 1978
• Expiry date: Jul 29, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/173
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of O,O-dimethyl-O-(2,2-dichlorovinyl)-thionophosphoric acid ester of the formula ##STR1## comprising reacting O,O-dimethyl-1-hydroxy-2,2,2-trichloroethane-thionophosphonic acid ester of the formula ##STR2## in isopropanol with a 30-50% aqueous solution of an alkali metal hydroxide, possibly present in a small molar excess.