Hydration across the 3,4-bond occurs readily in the cations of 4,6,7-trimethyl- and 2,4,6,7-tetramethyl-pteridine (on the evidence of 1H n.m.r. and u.v. spectra in aqueous acid), in spite of possible steric hindrance by the 4-methyl group. It is shown that the effects of hindering groups are not necessarily additive.
A. Albert and H. Yamamoto, J. Chem. Soc. C, 1968, 2292 DOI: 10.1039/J39680002292
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