Several 6-unsubstituted purines underwent addition of potassium hydrogen sulphite or sulphurous acid across the 1,6-double bond. The effect of substituents in the 2- and 8-positions on the stability of the adducts is discussed with reference to their u.v. and 1H n.m.r. spectra.
W. Pendergast, J. Chem. Soc., Perkin Trans. 1, 1975, 2240 DOI: 10.1039/P19750002240
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