Acetic Acid → 2,4(1H,3H)-Pyrimidinedione, 6-amino-1-methyl-5-nitroso-3-propyl-

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6-Amino-1-methyl-3-propyl-2,4(1H,3H)pyrimidinedione (V. Papesch and E. F. Schroeder, J. Org. Chem. 1951, 16, 1879) (5.53 g, 27.5 mmol) was dissolved in hot 95% ethanol (20 ml)-water (120 ml). Sodium nitrite (2.32 g) and glacial acetic acid (2.4 ml) were added. The resulting mixture was allowed to cool to room temperature. Orange-pink crystals were filtered off and dried at 50° C. under vacuum to give purple crystals of 6-amino-1-methyl-5-nitroso-3-propyl-2,4 (1H,3H)-pyrimidinedione (2.92 g, 80%); mp 250° dec. Analysis for (C8H12N4O3): C,45.28; H,5.70; N,26.40. Found: C,45.12; H,5.74; N,26.34.

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