In organic chemistry hydroxyanthraquinones refers to compounds with the formula C12H8−n(OH)n(CO)2 where n ≥ 1. Almost all hydroxyanthraquinones are derivative of 9,10-anthraquinone. Quoted by Khalafy and Bruce. Quoted by Khalafy and Bruce.
Isomers One peculiarity of the hydroxyanthraquinones is the relative obscurity of the monohydroxy derivatives. Most hydroxyanthraquinones have two or more hydroxy groups.
Dihydroxy Dihydroxyanthraquinones have the formula . The dyes alizarin (1,2-Dihydroxyanthraquinone) and quinizarin are prominent examples.
Trihydroxy Trihydroxyanthraquinones have the formula . 1,2,4-Trihydroxyanthraquinone, commonly called purpurin, is a naturally occurring red/yellow dye.
Tetrahydroxy Tetrahydroxyanthraquinones have the formula . The dye quinalizarin (1,2,5,8-tetrahydroxyanthraquinone is one example.
Hexahydroxy Hexahydroxyanthraquinones have the formula .1,2,3,5,6,7-hexahydroxy-9,10-anthraquinone (rufigallol) occurs in nature.
See also Hydroxybenzoquinone Hydroxynaphthoquinone
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