Conclusions
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1.
The electronic spectra of solutions of 4,6-bis-(phenylazo)-resorcinol, 2,4-bis-(phenylazo)-resorcinol, 2,4-bis-(phenylazo)-phenol, and bis-(phenylazo)-phloroglucinol in benzene and glacial acetic acid (GAC) have been studied.
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2.
4, 6-bis-(Phenylazo)-resorcinol exists in two tautomeric forms — the true azo form and the quinone hydrazone form. 2,4-Bis-(phenylazo)-phenol exists in the true azo form. The broad absorption lines of 2,4-bis- (phenylazo)-resorcinol and bis- (phenylazo)-phloroglucinol could not be resolved.
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3.
In the case of solutions of 4,6-bis-(phenylazo)-resorcinol in GAC a change with time in the tautomeric equilibrium between the true azo form and the quinone hydrazone form in the direction of the true azo form have been found
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Literature cited
V. P. Parini, I. V. Gudvilovich, and A. V. Sorokin, Izv. AN SSSR, Ser. khim.,1966, 572.
V. P. Parini and I. V. Gudvilovich, Izv. AN SSSR, Ser. khim.,1965, 370.
Eng. Bamberger, Ber.,35, 1611 (1902).
W. R. Orndorff and B. J. Ray, J. Amer. Chem. Soc.,44, 10 (1910).
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Deceased.
Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2038–2041, November, 1966.
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Berlin, A.A., Gudvilovich, I.V., Parini, V.P. et al. Electronic spectra and tautomerism of some bis-(phenylazo)-phenols. Russ Chem Bull 15, 1977–1979 (1966). https://doi.org/10.1007/BF01179721
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DOI: https://doi.org/10.1007/BF01179721