The spectra and basicities of “4,6-dihydroxypyrimidine” and its mono- and di-alkyl derivatives show that the parent compound exists in aqueous solution mainly as the mesomeric betaine together with an appreciable contribution of the 6-hydroxypyrimidin-4(3H)-one form.
A. R. Katritzky, F. D. Popp and A. J. Waring, J. Chem. Soc. B, 1966, 565 DOI: 10.1039/J29660000565
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