[F:1][C:2]1[CH:3]=[C:4]([CH:8]=[C:9]([CH3:11])[CH:10]=1)[C:5]([OH:7])=[O:6].[N+:12]([O-])([O-:14])=[O:13].[K+].O>OS(O)(=O)=O>[F:1][C:2]1[CH:10]=[C:9]([CH3:11])[C:8]([N+:12]([O-:14])=[O:13])=[C:4]([CH:3]=1)[C:5]([OH:7])=[O:6]3-Fluoro-5-methylbenzoic acid (4 g, 25.96 mmol) and KNO3 (2.884 g, 28.556 mmol) were dissolved in conc. H2SO4 (32 mL) at 0° C. The mixture was stirred at rt for 1 h. Water (60 mL) was added, and the resulting precipitate was filtered and dried to provide the title compound, which was used without further purification.
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