[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[N:8]1[C:12](=[O:13])[CH:11]=[C:10]([CH3:14])[N:9]1[CH3:15].[N+:16]([O-])([OH:18])=[O:17].O.CC(OC)(C)C>C(O)(C(F)(F)F)=O>[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[N:8]1[C:12](=[O:13])[C:11]([N+:16]([O-:18])=[O:17])=[C:10]([CH3:14])[N:9]1[CH3:15]2-(2-Fluorophenyl)-1,5-dimethyl-1H-pyrazol-3(2H)-one (260 g, 1261 mmol) in TFA (1040 ml) was cooled to −10° C. and stirred for 30 mins. To the mixture was added fuming nitric acid (84 ml) dropwise and this was stirred for 15 mins under cooling then at RT for 1 hr. The resulting mixture was poured onto a mixture of ice (1500 ml), water (1000 ml) and TBME (2500 ml) and stirred until the ice melted, then at RT for 1 hr. The mixture was filtered, washed with water (200 ml) and TBME (1000 ml). The collected crystals were dried to give the title compound as red-brown crystals.
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