[H-].[Na+].[CH3:3][O:4][C:5]1[CH:6]=[N:7][NH:8][CH:9]=1.Cl[C:11]1[N:12]=[N+:13]([O-:22])[C:14]2[CH:20]=[C:19]([Cl:21])[CH:18]=[CH:17][C:15]=2[N:16]=1>CN(C)C=O>[CH3:3][O:4][C:5]1[CH:6]=[N:7][N:8]([C:11]2[N:12]=[N+:13]([O-:22])[C:14]3[CH:20]=[C:19]([Cl:21])[CH:18]=[CH:17][C:15]=3[N:16]=2)[CH:9]=13.45 g (0.115 mol) of sodium hydride (80% pure) were introduced into a solution of 12.6 g (0.13 mol) of 4-methoxy-pyrazole in 100 ml of absolute dimethylformamide at room temperature and the mixture was subsequently warmed briefly to 60° C. 21.6 g (0.1 mol) of 3,7-dichloro-benzo-1,2,4-triazine 1-oxide were added in portions to the mixture, which had been cooled to room temperature. After the exothermic reaction had subsided, the mixture was subsequently stirred at 30° to 40° C. for a further 3 hours and the reaction product was then precipitated with water. This product was filtered off, stirred in 150 ml of methanol, filtered off again and dried. 17.3 g of 3-(4-methoxypyrazol-1-yl)-7-chloro-benzo-1,2,4-triazine 1-oxide of melting point 253°-255° C. (with decomposition) were obtained, that is to say 62.3% of theory. The compound could be recrystallized from dimethylformamide.
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