The condensation of 1,3-dialkylbarbituric acids with ethyl orthoacetate gives 7H-pyrano[2,3-d]pyrimidines. The structures of these dyes were confirmed by their reactions. The preparation and light absorptions of several non-ionic trinuclear dyes containing the pyrano[2,3-d]pyrimidine nucleus are discussed.
J. Bailey and J. A. Elvidge, J. Chem. Soc., Perkin Trans. 1, 1973, 823 DOI: 10.1039/P19730000823
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