[NH2:1][C:2]1[N:7]=[C:6]([NH2:8])[CH:5]=[C:4]([Cl:9])[N:3]=1.C([OH:12])C.C(OO)(=O)C>C(O)(=O)C>[NH2:1][C:2]1[N+:7]([O-:12])=[C:6]([NH2:8])[CH:5]=[C:4]([Cl:9])[N:3]=1144.5 G. of 2,4-diamino-6-chloropyrimidine are suspended in 2000 ml. of ethanol. The suspension is warmed to 35° C. while stirring (about 15 minutes), the greater part of the material passing into solution. This mixture is then cooled down to 6°-8° C. and at this temperature there are added dropwise within 40 minutes 175 ml. of 40% peracetic acid in glacial acetic acid. After completion of the addition, the mixture is stirred at 6°-8° C. for a further 30 minutes. Thereafter, the mixture is left to warm up to room temperature, and stirred at this temperature for 3 hours. 2000 Ml. of petroleum ether are added, the mixture is stirred for 1 hour and then left to stand overnight. The separated precipitate is filtered off, back-washed with 200 ml. of petroleum ether and dried under reduced pressure, there being obtained 2,4-diamino-6-chloro-pyrimidine-3-oxide. Recrystallization yields analytically pure product having a melting point of 193° C.
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