Tautomerism of anthraquinones: XI. 1-amino-4-hydroxyanthraquinone

Tautomerism of anthraquinones: XI. 1-amino-4-hydroxyanthraquinone

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...

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Veröffentlicht in:Russian journal of organic chemistry 2010-05, Vol.46 (5), p.655-660
Hauptverfasser: Fain, V. Ya, Zaitsev, B. E, Ryabov, M. A
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creator Fain, V. Ya
Zaitsev, B. E
Ryabov, M. A
description 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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title Tautomerism of anthraquinones: XI. 1-amino-4-hydroxyanthraquinone
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