689. Anthrarufin

Nomenclature

CAS number: 117-12-4
1,5-Dihydroxy-9,10-anthracenedione; 1,5-dihydroxyanthraquinone.
C14H8O4; mol wt 240.21.
C 70.00%, H 3.36%, O 26.64%.

Description and references

Prepd from 1,5-anthraquinone potassium disulfonate: Fierz-David, Blangey, Farbenchemie (Vienna, 5th ed, 1943), pp 224-225.

Chemical structure

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.

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.