Title: Gentisin
CAS Registry Number: 437-50-3
CAS Name: 1,7-Dihydroxy-3-methoxy-9H-xanthen-9-one
Additional Names: 4,7-dihydroxy-2-methoxyxanthone; gentianic acid; gentianin; gentiin
Molecular Formula: C14H10O5
Molecular Weight: 258.23
Percent Composition: C 65.12%, H 3.90%, O 30.98%
Literature References: From root of Gentiana lutea L., Gentianaceae: Henry, Caventou, J. Pharm. Chim. 1821, 178; Canonica, Pelizzoni, Gazz. Chim. Ital. 85, 1007 (1955). Structure: Korte, Ber. 87, 1357 (1954). Synthesis: Anand, Venkataraman, Proc. Indian Acad. Sci. 25A, 438 (1947); Rao, Seshadri, ibid. 37A, 710 (1953).
Properties: Yellow needles from alc, mp 266-267°. Absorption max (methanol): 260, 275, 315, 410 nm (log e 4.35, 4.30, 4.10, 3.70). Very slightly sol in water or organic solvents.
Melting point: mp 266-267°
Absorption maximum: Absorption max (methanol): 260, 275, 315, 410 nm (log e 4.35, 4.30, 4.10, 3.70)
Derivative Type: Diacetate
Molecular Formula: C18H14O7
Molecular Weight: 342.30
Percent Composition: C 63.16%, H 4.12%, O 32.72%
Properties: Crystals from alc, mp 196-197°. uv max (methanol): 240, 270, 300 nm (log e 4.58, 4.05, 4.10).
Melting point: mp 196-197°
Absorption maximum: uv max (methanol): 240, 270, 300 nm (log e 4.58, 4.05, 4.10)
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