Condensations of 4,5-diaminopyrimidines and phosphonic diamides in a high-boiling solvent produce diazaphospholopyrimidine oxides. These are hydrolytically unstable and give rise to derivatives of N-pyrimidinylphosphonamidic acid.
J. H. Lister and G. M. Timmis, J. Chem. Soc. C, 1966, 1242 DOI: 10.1039/J39660001242
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