Title: Hamamelitannin
CAS Registry Number: 469-32-9
CAS Name: 2-C-[[(3,4,5-Trihydroxybenzoyl)oxy]methyl]-D-ribofuranose 5-(3,4,5-trihydroxybenzoate)
Additional Names: 2-C-(hydroxymethyl)-D-ribofuranose 2¢,5-digallate
Molecular Formula: C20H20O14
Molecular Weight: 484.36
Percent Composition: C 49.59%, H 4.16%, O 46.24%
Literature References: From bark of Hamamelis virginiana L., Hamamelidaceae: Grüttner, Arch. Pharm. 236, 278 (1898); from bark of Castanea dentata (Marsh.) Borkh., Fagaceae: Mayer, Kunz, Naturwissenschaften 46, 206 (1959). Structure: Mayer et al., Ann. 688, 232 (1965). Synthesis: Ezekiel et al., Carbohydr. Res. 11, 233 (1969).
Properties: Prisms from water, mp 145-147°. [a]D19 +32.6° (c = 1.5).
Melting point: mp 145-147°
Optical Rotation: [a]D19 +32.6° (c = 1.5)
Derivative Type: Hexamethyl ether
Molecular Formula: C26H32O14
Molecular Weight: 568.52
Percent Composition: C 54.93%, H 5.67%, O 39.40%
Properties: Needles from dioxane + water, mp 73-76°. [a]25578 +10.0° (c = 2.0 in dioxane). Sol in acetone, dioxane, methanol. Practically insol in water.
Melting point: mp 73-76°
Optical Rotation: [a]25578 +10.0° (c = 2.0 in dioxane)
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