Trihydroxyanthraquinone
Introduction A '''trihydroxyanthraquinone''' or '''trihydroxyanthracenedione''' is any of several isomeric organic compounds with formula , formally derived from anthraquinone by replacing three hydrogen atoms by hydroxyl groups. They include several historically important dyes. The isomers may differ in the parent anthraquinone isomer and/or of the three hydroxyl groups.In general there are 56 ways of choosing three out of the 8 hydrogens. However, if the underlying core is symmetrical, some of these choices will give identical molecules.
Isomers ===From 9,10-anthraquinone===Due to the symmetry of the 9,10-anthraquinone core, there are only 14 isomers. *1,2,3-Trihydroxyanthraquinone (anthragallol) *1,2,4-Trihydroxyanthraquinone (purpurin), a component of madder root dye. *1,2,5-Trihydroxyanthraquinone (oxyanthrarufin) *1,2,6-Trihydroxyanthraquinone (flavopurpurin) *1,2,7-Trihydroxyanthraquinone (isopurpurin, anthrapurpurin)*1,2,8-Trihydroxyanthraquinone (oxychrysazin)*1,3,5-Trihydroxyanthraquinone *1,3,6-Trihydroxyanthraquinone *1,3,7-Trihydroxyanthraquinone *1,3,8-Trihydroxyanthraquinone *1,4,5-Trihydroxyanthraquinone *1,4,6-Trihydroxyanthraquinone *1,6,7-Trihydroxyanthraquinone *2,3,6-Trihydroxyanthraquinone
See also *Hydroxyanthraquinone*Dihydroxyanthraquinone*Tetrahydroxyanthraquinone*Pentahydroxyanthraquinone*Hexahydroxyanthraquinone*Heptahydroxyanthraquinone*Octahydroxyanthraquinone
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