4454. β-Glucogallin

Nomenclature

CAS number: 13405-60-2
β-d-Glucopyranose 1-(3,4,5-trihydroxybenzoate); β-d-glucopyranose-1-gallate; glucogallic acid; 1-galloyl-β-d-glucose.
C13H16O10; mol wt 332.26.
C 46.99%, H 4.85%, O 48.15%.

Description and references

Glucoside or glucotannoid from chinese rhubarb, Rheum officinale, Baill., Polygonaceae: Gilson, Compt. Rend. 136, 385 (1903). Structure and synthesis: Fischer, Bergmann, Ber. 51, 1760 (1918); Schmidt, Schmadel, Ann. 649, 149 (1961).

Chemical structure

Properties

Bitter microscopic prisms from water, methanol or 80% ethanol, mp 207°. [α]D25 24.5° (c = 1.75 in water). Freely sol in hot water. Sparingly sol in cold water, methanol, ethanol, acetone, ethyl acetate. Practically insol in ether, benzene, chloroform, petr ether.