Preparation of dithiophosphoric acid ester dihalides

US4082822A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Joachim Diehr · Wuppertal, DE
• Hermann Arold · Wuppertal, DE

Key dates

• Filing date: Jul 12, 1976
• Grant date: Apr 4, 1978
• Expiry date: Jul 12, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/20
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of a dithiophosphoric acid ester dihalide of the formula ##STR1## in which X is chlorine, bromine, fluorine or iodine, and PA1 R is an alkyl radical with up to 15 carbon atoms optionally substituted by halogen, by alkoxy or by alkylthio, a cycloaliphatic radical with 5 or 6 ring members, an aralkyl radical with 7 to 15 carbon atoms or an aryl or heterocyclic radical, Comprising reacting a thiol compound of the formula EQU R--SH with a thiophosphoryl halide of the formula EQU PSX.sub.3 in the presence of a catalyst selected from the group consisting of a metal, an anhydrous metal halide, a Lewis acid, a nitrogen-alkylated lactam or an N,N-disubstituted carboxylic acid amide or phosphoric acid amide at a temperature of about 0.degree. to 170.degree. C.