Abstract
It is shown on the basis of data from the UV and IR spectra that keto acids of the indole series exist in the open acid form. The anomalies in the spectral behavior in alkaline media are determined by the formation of an anion involving the indole hydrogen atom.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 659–663, May, 1975.
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Kost, A.N., Yurovskaya, M.A. & Khao, N.M. Chemistry of indoles. Chem Heterocycl Compd 11, 574–578 (1975). https://doi.org/10.1007/BF00480482
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DOI: https://doi.org/10.1007/BF00480482