Nitric Acid → 4,5-Dichloro-2-nitrophenol

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반응 단계

To a solution of 3,4-dichlorophenol (30 g, 185 mmol) in DCM (300 mL) at −15° C., sulfuric acid (24 g, 278 mmol) was added. To this mixture, nitric acid (19 g, 194 mmol) was added dropwise (over 20 min) and the temperature was controlled between −15° C. to −5° C. The resulting mixture was stirred at 0° C. for 1 h. The mixture was poured into ice and extracted with ethyl acetate. The combined organic layer was washed with water, saturate NaHCO3 aqueous solution and brine, dried over Na2SO4 and then concentrated in vacuo. The residue was purified by flash column chromatography on silica gel (petroleum ether/ethyl acetate=100:1) to afford the desired product (16 g, 42% yield) as a solid.

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