Process for the preparation of bifunctional tertiary aromatic phosphine oxides

US4816605A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hans-Jerg Kleiner · Kronberg, DE
• Erwin Weiss · Hofheim, DE

Key dates

• Filing date: Sep 9, 1986
• Grant date: Mar 28, 1989
• Expiry date: Sep 9, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/5325
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Tertiary aromatic phosphine oxides of the formula ##STR1## in which X=F, Cl or Br, are prepared by Friedel-Crafts reaction of (a) phenylthiophosphonic dichloride with fluoro-, chloro-or bromobenzene, or PA1 (b) of dichlorophenylphosphine, sulfur and fluoro-, chloro-or bromobenzene, and PA1 (c) subsequent conversion of the phosphine sulfides produced by (a) or (b) using H.sub.2 O.sub.2 in a solvent which comprises at least about 2% by weight, preferably at least about 10% by weight, of optionally halogenated lower aliphatic carboxylic acids and/or their anhydrides and, if appropriate, of other inert solvents which are miscible therewith. The reaction products are final products and intermediates in various specialized fields, such as, for example, in the plant protection sector and the polymers sector.