Tautomerism of anthraquinones: VIII. Tautomerism and conformations of 1,4-diamino-9,10-anthraquinone |
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Authors: | V. Ya. Fain B. E. Zaitsev M. A. Ryabov |
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Affiliation: | (1) Russian University of Peoples’ Friendship, ul. Miklukho-Maklaya 6, Moscow, 117198, Russia |
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Abstract: | The compound widely known as 1,4-diamino-9,10-anthraquinone is in fact an equilibrium mixture of 4,9-diamino-1,10-anthraquinone and tautomeric imino forms, 10-amino-9-hydroxy-1,4-anthraquinone 1-imine and its conformer, and 4-amino-1-hydroxy-9,10-anthraquinone 9-imine or 4,9-dihydroxy-1,10-anthraquinone diimine. Amino-imino tautomerism and rotational isomerism are responsible for fine structure of the πl,π*-absorption of the title compound. |
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