Abstract
It was shown by means of IR, UV, and PMR spectra that β-(3-nitro-2-pyridyl)pyruvic acid esters are practically completely enolized in the crystal state and in solution; ethyl β-(3-nitro-4-pyridyl)pyruvate has an enol structure in the crystalline state and in pyridine solution but exists as a mixture of keto and enol forms in low-polarity solvents.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 389–393, March, 1974.
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Peresleni, E.M., Uritskaya, M.Y., Azimov, V.A. et al. Structure, tautomerism, and transformations of β-(3-nitro-2-pyridyl)- and β-(3-nitro-4-pyridyl)pyruvic acid esters. Chem Heterocycl Compd 10, 340–344 (1974). https://doi.org/10.1007/BF00472426
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DOI: https://doi.org/10.1007/BF00472426