beta-Glucogallin
Title: b-Glucogallin
CAS Registry Number: 13405-60-2
CAS Name: b-D-Glucopyranose 1-(3,4,5-trihydroxybenzoate)
Additional Names: b-D-glucopyranose-1-gallate; glucogallic acid; 1-galloyl-b-D-glucose
Molecular Formula: C13H16O10
Molecular Weight: 332.26
Percent Composition: C 46.99%, H 4.85%, O 48.15%
Literature 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).
Properties: Bitter microscopic prisms from water, methanol or 80% ethanol, mp 207°. [a]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.
Melting point: mp 207°
Optical Rotation: [a]D25 -24.5° (c = 1.75 in water)

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