[N+:1]([O-:4])(O)=[O:2].[CH3:5][O:6][C:7]1[CH:8]=[CH:9][C:10]([CH3:17])=[C:11]([NH:13][C:14](=[O:16])[CH3:15])[CH:12]=1.S(=O)(=O)(O)O>C(O)(=O)C>[CH3:5][O:6][C:7]1[C:8]([N+:1]([O-:4])=[O:2])=[CH:9][C:10]([CH3:17])=[C:11]([NH:13][C:14](=[O:16])[CH3:15])[CH:12]=1Nitric acid (70%, 2.5 mL, 25.14 mmol) was added, dropwise, at a temperature ranging between 5 and 10° C., to a mixture of N-(5-methoxy-2-methyl-phenyl)-acetamide (3.0 g, 16.76 mmol) and concentrated sulfuric acid (10 mL) in glacial acetic acid (20 mL) and the resulting mixture was stirred for 3 hours. The reaction mixture was poured into ice-water and the solid formed was collected by filtration. The residue was dissolved in dichloromethane, dried over anhydrous sodium sulfate, filtered and evaporated under reduced pressure to give 2.135 g of N-(5-methoxy-2-methyl-4-nitro-phenyl)-acetamide as an off-white solid.
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