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Class of chemical compounds From Wikipedia, the free encyclopedia
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.[3][4][5]
One peculiarity of the hydroxyanthraquinones is the relative obscurity of the monohydroxy derivatives. Most hydroxyanthraquinones have two or more hydroxy groups.
Dihydroxyanthraquinones have the formula C12H6(OH)2(CO)2. The dyes alizarin (1,2-Dihydroxyanthraquinone) and quinizarin are prominent examples.
Trihydroxyanthraquinones have the formula C12H5(OH)3(CO)2. 1,2,4-Trihydroxyanthraquinone, commonly called purpurin, is a naturally occurring red/yellow dye.
Tetrahydroxyanthraquinones have the formula C12H4(OH)4(CO)2. The dye quinalizarin (1,2,5,8-tetrahydroxyanthraquinone is one example.
Dihydroxyanthraquinones have the formula C12H2(OH)6(CO)2.1,2,3,5,6,7-hexahydroxy-9,10-anthraquinone (rufigallol) occurs in nature.
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