Method for isolating 3-[2-chloro-4-(trifluoromethyl)-phenoxy]-benzoic acid

US6066761A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans Rupert Merkle · Ludwigshafen, DE
• Ronald R. Eva · Durham, US
• Dirk Franke · Birkenheide, DE
• Simon Jones · Leimen, DE
• Wolfgang Mattmann · Schifferstadt, DE
• Manfred Munzinger · Dirmstein, DE

Key dates

• Filing date: Jul 28, 1999
• Grant date: May 23, 2000
• Expiry date: Jul 28, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/02
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the isolation of 3-[2-chloro-4-(trifluoromethyl)phenoxy]benzoic acid of the formula I ##STR1## from an aqueous solution of its metal salt comprises a) reacting the metal salt of 3-[2-chloro-4-(trifluoromethyl)phenoxy]benzoic acid with an organic or inorganic acid; PA1 b) heating the reaction mixture until a liquid two-phase system of organic and aqueous phase has formed; and PA1 c) separating the organic phase from the aqueous phase.