[C:1]([C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][C:6]=1[NH:11][C:12](=[O:14])[CH3:13])([CH3:4])([CH3:3])[CH3:2].[N+:15]([O-])([O-:17])=[O:16].[K+]>S(=O)(=O)(O)O>[C:1]([C:5]1[CH:10]=[C:9]([N+:15]([O-:17])=[O:16])[CH:8]=[CH:7][C:6]=1[NH:11][C:12](=[O:14])[CH3:13])([CH3:4])([CH3:2])[CH3:3]Concentrated sulfuric acid (30 mL) was cooled to 0° C. and solid N-(2-tert-butylphenyl)acetamide (1.0 g, 5.2 mmol) was added in several portions. To the resulting solution was added KNO3 (578 mg, 5.7 mmol). The reaction mixture was allowed to warm to rt over 2 h and then stirred at rt overnight. The reaction mixture was poured over ice and a white precipitate formed. The precipitate was isolated by filtration (1.04 g, 84%). LCMS: (FA) ES+ 237.2 (M+1), ES− 235.1 (M−1).
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