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