3-Fluoro-4-methoxyacetophenone oxime ether (39.4 mg, 0.2 mmol) was dissolved in 2 mL of ether, 37% hydrochloric acid was added and the reaction was stirred for 30 h at room temperature. The reaction process was monitored by thin layer chromatography (TLC). Upon completion of the reaction, the reaction solution was neutralized with saturated sodium carbonate solution to pH 7, followed by extraction of the mixture with ether (10 mL × 3). The organic phases were combined, dried with anhydrous sodium sulfate, and concentrated under reduced pressure to remove the solvent. The crude product was purified by column chromatography (eluent ratio: petroleum ether/ethyl acetate = 20:1, v/v), and the eluent containing the target product was collected, and the solvent was removed by distillation under reduced pressure to afford 2-fluoro-4-methoxyacetophenone (26.5 mg, 79% yield).
