Trihydroxyanthraquinone
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
- 1,2,4-Trihydroxyanthraquinone, a component of madder root dye.
- 1,2,5-Trihydroxyanthraquinone
- 1,2,6-Trihydroxyanthraquinone
- 1,2,7-Trihydroxyanthraquinone
- 1,2,8-Trihydroxyanthraquinone
- 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