8292. Rufigallol

Nomenclature

CAS number: 82-12-2
1,2,3,5,6,7-Hexahydroxy-9,10-anthracenedione; 1,2,3,5,6,7-hexahydroxyanthraquinone; rufigallic acid; C.I. 58600.
C14H8O8; mol wt 304.21.
C 55.27%, H 2.65%, O 42.07%.

Description and references

Prepd by the action of H2SO4 on gallic acid: Robiquet, Ann. 19, 204 (1836); by dry distn of gallic acid: Kunz-Krause, Manicke, Ber. 53, 190 (1920). See also: Colour Index vol. 4 (3rd ed., 1971) p 4520.

Chemical structure

Properties

Red needles. Does not melt, but sublimes with partial decompn upon heating. Absorption spectrum: Treibs, Steinmetz, Ann. 506, 171, 191 (1933). Practically insol in water. Freely sol in acetone; slightly sol in alcohol, ether, with yellow color. Sol in alkali hydroxide solns with violet color, but is soon dec by oxidation.

Derivative

Hexamethyl ether.
C20H20O8; mol wt 388.37.
C 61.85%, H 5.19%, O 32.96%.

Properties

Yellow needles, mp 240°.

Use

For color reactions with Zr and Hf.