2-bromo-5-nitrobenzaldehyde

6630-33-7

84459-32-5

2-Bromobenzaldehyde (10.0 g, 53.7 mmol) was dissolved in concentrated sulfuric acid (100 mL) at 0 °C. Potassium nitrate (5.43 g, 53.7 mmol) was added in batches over 1 h at this temperature. After addition, the reaction mixture was continued to be stirred for 40 min, followed by the addition of potassium nitrate (0.72 g). The reaction temperature was maintained at 0°C and stirring was continued for 3 hours. After completion of the reaction, the mixture was slowly poured into ice water. The precipitate precipitated was collected by filtration, washed well with water and finally recrystallized with ethyl acetate/pentane mixed solvent to give 2-bromo-5-nitrobenzaldehyde (11.7 g, 94% yield) as a white solid. The mass spectrometry (ESI) analysis was consistent with the theoretical value of C7H4BrNO3 (228.9).