It was shown by 1H and 13C NMR spectroscopy that the 2-aryl-6-oxohexahydropyrimidine-4-carboxylic acid sodium salts existed in D2O solution as a tautomeric mixture of cyclic and linear forms. The cyclic form consisted of two (2RS,4S)-stereoisomers, differing in the aryl substituent configuration at the pyrimidine ring C-2 atom.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 640–645, April, 2013.
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Ershov, A.Y., Nasledov, D.G., Nasonova, K.V. et al. Ring-chain tautomerism of 2-aryl-6-oxohexahydropyrimidine-4-carboxylic acid sodium salts. Chem Heterocycl Comp 49, 598–603 (2013). https://doi.org/10.1007/s10593-013-1287-0
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DOI: https://doi.org/10.1007/s10593-013-1287-0