Process for the preparation of chlorofluoronitrobenzenes

US5463148A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Theodor Papenfuhs · Frankfurt, DE
• Andreas Kanschik-Conradsen · Garbsen, DE
• Wilfried Pressler · Kelkheim, DE

Key dates

• Filing date: May 5, 1994
• Grant date: Oct 31, 1995
• Expiry date: May 5, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C201/12
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of chlorofluoronitrobenzenes in high yields, by reacting dichloronitrobenzenes with alkali metal fluorides having a water content of up to about 2.5% by weight in the presence of a quaternary ammonium and/or phosphonium salt, a crown ether and/or polyethylene glycol dimethyl ether as catalyst in the presence of an aprotic solvent, the boiling point of which is below the reaction temperature under the pressure conditions chosen, at temperatures of about 125.degree. to about 200.degree. C.