Pyrimidin-2(1H)-one and pyrimidin-2(1H),4(3H)-dione (uracil) and their N-methyl derivatives are nitrated in sulphuric acid as the oxo-(or dioxo-) tautomeric forms of the free base species. Rate constants are compared with those for other heterocycles and the influence of the ring NH and CO groups is discussed.
C. D. Johnson, A. R. Katritzky, M. Kingsland and E. F. V. Scriven, J. Chem. Soc. B, 1971, 1 DOI: 10.1039/J29710000001
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