Phenol → 4-Acetylamino-3-fluoro-1-(1,1,2,2-tetrafluoroethoxy)benzene

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0.93 Gram of 4-acetylamino-3-fluorophenol, 0.15 g of potassium carbonate and 15 ml of dimethylformamide were added to a reactor and stirred for 20 minutes at an oil bath temperature of from 60° to 70° C. Thereafter, this solution was violently stirred at the same temperature for 1 hour under the stream of a tetrafluoroethylene gas in excess of said phenol. The reaction solution was cooled and after adding water, extracted with two 100-ml portions of diethyl ether. The ether layers were combined, washed with water, dried and concentrated to obtain a crude product. This crude product was subjected to chromatography on silica gel to obtain 1.46 g of 4-acetylamino-3-fluoro-1-(1,1,2,2-tetrafluoroethoxy)benzene.

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