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温度

0 °C

[3,5-Dimethyl-4-nitrophenol was synthesized by the reference procedures (U.S. Pat. No. 4,564,640)] 750 ml of Concentrated hydrochloric acid was added to a solution of 3,5-dimethylphenol (80.6 g) in 750 ml of 95% ethanol. The mixture was cooled to 0° C. in an ice/methanol bath. While maintaining the temperature of the reaction mixture below 5° C., a solution of NaNO2 (69.0 g) in 150 ml of water was added dropwise to the reaction mixture. The mixture was stirred at 0° C. for more than an hour and then poured into 9 liters of water. The aqueous mixture was filtered to give a yellow solid which was recrystallized from hot methanol and filtered to give 71.45 g of 3,5-dimethyl-4-nitrosophenol as a yellow solid. Mp. 180-181° C.

1. temperatureWhile maintaining the temperature of the reaction mixture below 5° C.
2. filtrationThe aqueous mixture was filtered
3. customto give a yellow solid which
4. customwas recrystallized from hot methanol
5. filtrationfiltered