PROCESS FOR THE PREPARATION OF 2,4,5-TRIFLUOROBENZONITRILE

摘要

HOE 92/F 051 of the disclosure: Process for the preparation of 2,4,5-trifluorobenzo-nitrile The present invention relates to a process for the preparation of 2,4,5-trifluorobenzonitrile in which 2,4dichloro-5-fluorobenzonitrile is reacted with approximately 100 to approximately 300 mol % of an alkali metal fluoride or of a tetraalkyl(C1-C18)ammonium fluoride or mixtures of such fluorides per chlorine atom to be exchanged, at temperatures from approximately 80 to approximately 250.degree.C, in the presence of a phase transfer catalyst, if appropriate in a dipolar aprotic solvent.