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Some Specific Features of Acid Nitration of 2-Substituted 4,6-Dihydroxypyrimidines.Nucleophilic Cleavage of the Nitration Products.-The nitration of 2-methylpyrimidine (I) by HNO 3 in conc. H 2 SO 4 occurs at both the 5 position of the ring and the carbon of the methyl group to afford tetranitropyrimidine (II). In neutral or acidic water, decomposition of the nitrated product takes place with isolation of dinitrodiaminoethene (IV). When compound (II) is treated with aqueous KOH, dipotassium salt (III) can be isolated. Tetranitropyrimidine (II) is cleaved with ethanol to afford carbamate (VI). The 2-amino pyrimidine (VII) provides linear dinitro product (VIII) under similar conditions as for the nitration of 2-methylpyrimidine (I) followed by treatment with water. -(ASTRAT'EV, A. A.; DASHKO, D. V.; MERSHIN, A. YU.; STEPANOV, A. I.; URAZGIL'DEEV, N. A.; Russ. J.