A recent interpretation of the structures of the pseudobases of the 1,5-dimethyl-1,5-naphthyridine and 5,6-dihydroimidazo[1,2,3-ij][1,8]naphthyridine dications which involves species bearing bridgehead hydrogen atoms is shown to be in error. The spectral data are consistent with the major pseudobase species being the expected 1,2-dihydro-2-hydroxynaphthyridines.
J. W. Bunting, J. Chem. Soc., Perkin Trans. 1, 1974, 1833 DOI: 10.1039/P19740001833
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