Abstract
Pyrido[1,2-a]pyrimidinium salt derivatives have been prepared by condensation of 2-aminopyridinium salts with Β-dicarbonyl compounds. The acid-base equilibrium dissociation constants for 2,4-dimethyl-9-hydroxypyrido[1,2-a]pyrimidinium perchlorate have been measured, and the spectroscopic characteristics of its neutral, anionic, and cationic forms have been determined; the electronic absorption spectra of the neutral and anionic forms of 2,4-dimethyl-9-hydroxypyrido[1,2-a]-pyrimidinium perchlorate have been interpreted based on this experimental and calculated data.
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Literature Cited
S. B. Gashev, S. V. Nikitin, and L. D. Smirnov, Khim. Geterotsikl. Soedin., No. 9, 1288 (1988).
A. M. Khmaruk, Yu. M. Volovenko, and V. A. Chuiguk, Ukr. Khim. Zh., 38, 262 (1972).
A. R. Katritzky (ed.), Physical Methods in Heterocyclic Chemistry [Russian translation], Khimiya, Moscow-Leningrad (1966).
G. R. Glemo and A. F. Daglish, J. Chem. Soc., No. 6, 1481 (1950).
R. G. Charles, Spectrochim. Acta, 8, 1 (1956).
A. R. Katritzky and R. A. Jones, J. Chem. Soc., No. 6, 2942 (1960).
L. Bellamy, Infrared Spectra of Complex Molecules, 2nd Edition, Methuen, London (1966).
A. Albert and E. Serjeant, Ionization Constants of Acids and Bases' Methuen and Co., London, and Wiley, New York (1962).
M. Dewar, Molecular Orbital Methods in Organic Chemistry [Russian translation], Mir, Moscow (1972).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1381–1387, October, 1991.
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Leon Palomino, M.I., Zaitsev, B.E., Gashev, S.B. et al. Synthesis, electronic structure, and absorption spectra of 9-hydroxypyrido[1,2-a]-pyrimidinium derivatives. Chem Heterocycl Compd 27, 1110–1115 (1991). https://doi.org/10.1007/BF00486808
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DOI: https://doi.org/10.1007/BF00486808