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1,2,5,8-TETRAHYDROXYANTHRAQUINONE

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1,2,5,8-TETRAHYDROXYANTHRAQUINONE Basic information
1,2,5,8-TETRAHYDROXYANTHRAQUINONE Chemical Properties
Safety Information
1,2,5,8-TETRAHYDROXYANTHRAQUINONE Usage And Synthesis
  • Uses1,2,5,8-TETRAHYDROXYANTHRAQUINONE is Al salts dark red, cotton mordanted with Cr salts bluish-violet. No longer used as a dye, except occasionally in printing cotton.
  • PreparationQuinalizarin. 1,2-Dihydroxyanthracene-9,10-dione or 1,4-Dihydroxyanthracene-9,10-dione with great excess fuming sulfuric acid oxidation and hydrolysis.
  • DefinitionChEBI: A tetrahydroxyanthraquinone having the four hydroxy groups at the 1-, 2-, 5- and 8-positions.
  • Properties and Applicationsviolet (chromium), dark red light purple (aluminum). Soluble in ethanol. In concentrated sulfuric acid for blue purple, dilution after dark red precipitation.
    Standard Ironing Fastness Light Fastness Fulling Persperation Fastness Soaping Water
    Alkali Acid
    ISO 6 4-5 5 4-5
  • Purification MethodsCrystallise the quinone from acetic acid or nitrobenzene. It can be sublimed in vacuo. The Cu salt forms red crystals. [Beilstein 8 H 549, 8 I 755, 8 II 584.]
1,2,5,8-TETRAHYDROXYANTHRAQUINONE(81-61-8)Related Product Information
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