Tautomerism of anthraquinones: XI. 1-amino-4-hydroxyanthraquinone |
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Authors: | V Ya Fain B E Zaitsev M A Ryabov |
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Institution: | 1.Russian University of Peoples’ Friendship,Moscow,Russia |
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Abstract: | The disperse dye red 2C regarded as 1-amino-4-hydroxy-9,10-anthraquinone is not a 9,10-anthraquinone derivative. It is characterized
by a keto-enol and amino-imine tautomerism, and it consists of equilibrium mixtures of tautomers and conformers containing
4-amino-9-hydroxy-1,10-, 9 amino-4-hydroxy-1,10-, 9 amino-10-hydroxy-1,4-anthraquinones, 9 hydroxy-1,10-anthraquinone 10-imine,
and also their conformers with a single intramolecular hydrogen bond. The significant differences in the absorption spectra
known for this dye originate from the dissimilar isomeric composition of the samples of this dye prepared or purified by various
procedures |
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