By using the time-resolved chemically induced dynamic nuclear polarization technique, we show that the neutral guanosyl radical, G(-H), formed in the reaction of guanosine-5′-monophosphate with a triplet-excited 3,3′,4,4′-tetracarboxy benzophenone in neutral aqueous solution, protonates readily at the N7 position with the formation of a new guanosyl cation radical (G+)'.
Morozova, O. B., Fishman, N. N., & Yurkovskaya, A. V. (2017). Indirect NMR detection of transient guanosyl radical protonation in neutral aqueous solution. Physical Chemistry Chemical Physics, 19(32), 21262–21266. https://doi.org/10.1039/c7cp03797j