CAS Registry Number: 117-12-4
CAS Name: 1,5-Dihydroxy-9,10-anthracenedione
Additional Names: 1,5-dihydroxyanthraquinone
Molecular Formula: C14H8O4
Molecular Weight: 240.21
Percent Composition: C 70.00%, H 3.36%, O 26.64%
Literature References: Prepd from 1,5-anthraquinone potassium disulfonate: Fierz-David, Blangey, Farbenchemie (Vienna, 5th ed, 1943), pp 224-225.
Properties: Green to yellow crystals from acetic acid, mp 280°. Sublimes at 120°. Absorption spectrum in H2SO4: Meyer, Fischer, Ber. 46, 85 (1913). Sol in concd H2SO4, in aq KOH soln (reddish color); insol in aq Na2CO3, NH3, Ba(OH)2. Moderately sol in alcohol, slightly in water.
Melting point: mp 280°
Use: Important intermediate in the manuf of alizarin and indanthrene dyestuffs. Forms insol Ba and Ca lakes; has been proposed as analytical reagent for the detection of Ca.