Conclusions
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1.
The compounds 2-pyridylazoresorcinol, 2-(2-pyridylazo)-1-naphthol, and l-(2-pyridylazo)-2-naphthol exist in solution in organic solvents mainly as the quinonehydrazone form, while 1-(2-pyridylazo)-4-naphthol exists as the azo form.
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2.
It was postulated that the reason for stabilizing the quinonehydrazone form is the presence of a 2-pyridyl substituent and an intramolecular hydrogen bond in the studied o-hydroxyazo compounds.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 927–929, April, 1983.
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Fedorov, L.A., Grebenshchikov, N.I., Akimova, T.G. et al. Structure of some pyridyl-hydroxyazo compounds in solution. Russ Chem Bull 32, 841–843 (1983). https://doi.org/10.1007/BF00953491
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DOI: https://doi.org/10.1007/BF00953491