In the 3,4-dihydro-1,3-dimethyl-5,6-diphenyl-4-oxopteridinium cation, and in the 1,3-dimethyl-8-phenylhypoxanthinium cation, position 2 of the pyrimidine ring is reduced by sodium borohydride. The analogous reaction at position 8 was observed for the 7,9-dimethylhypoxanthinium cation. The structures assigned to the reduction products are supported by u.v., i.r., and n.m.r. spectra and by degradation reactions.
Z. Neiman, J. Chem. Soc. C, 1970, 91 DOI: 10.1039/J39700000091
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