Process for preparing fluorobenzonitriles

US5466859A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Thomas Schach · Gernsheim, DE
• Theodor Papenfuhs · Frankfurt, DE
• Ralf Pfirmann · Griesheim, DE

Key dates

• Filing date: Jul 19, 1994
• Grant date: Nov 14, 1995
• Expiry date: Jul 19, 2014

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2231/40
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Fluorobenzonitriles and chlorofluorobenzonitriles are prepared in an advantageous manner from the corresponding chlorobenzonitriles and an alkali metal fluoride in a chlorine-fluorine exchange reaction, by catalyzing the reaction with a quaternary ammonium compound comprising at least one alkoxypolyoxyalkyl radical.