Photolysis of 4,6-di-R-pyrimidine 1-oxides (R = Ph or But) in methanol with a high-pressure mercury arc and a Rayonet RPR 2537 Å lamp, respectively, leads to 3,5-di-R-pyrazoles. In the case R = Ph, in addition to the pyrazole, 2-methoxy-4,6-diphenylpyrimidine is obtained. This compound is considered to be formed via an oxaziridine intermediate, the existence of which was indicated by the liberation of iodine from potassium iodide.
F. Roeterdink and H. C. van der Plas, J. Chem. Soc., Perkin Trans. 1, 1976, 1202 DOI: 10.1039/P19760001202
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