Title: Centaurein
CAS Registry Number: 35595-03-0
CAS Name: 7-(b-D-Glucopyranosyloxy)-5-hydroxy-2-(3-hydroxy-4-methoxyphenyl)-3,6-dimethoxy-4H-1-benzopyran-4-one
Additional Names: 3¢,5,7-trihydroxy-3,4¢,6-trimethoxyflavone 7-b-D-glucoside
Molecular Formula: C24H26O13
Molecular Weight: 522.46
Percent Composition: C 55.17%, H 5.02%, O 39.81%
Literature References: Isoln from root of Centaurea jacea L., Compositae: Bridel, Charaux, Compt. Rend. 175, 833, 1168 (1922). Structure: Farkas et al., Ber. 97, 1666 (1964).
Derivative Type: Monohydrate
Properties: Yellow crystals, mp 208-209°. [a]D20 -76.6° (c = 1.4 in methanol). uv max (methanol): 349, 258 nm (log e 4.31, 4.30). Sol in hot water, hot alcohol, and hot acetone; practically insol in cold water, chloroform, ether.
Melting point: mp 208-209°
Optical Rotation: [a]D20 -76.6° (c = 1.4 in methanol)
Absorption maximum: uv max (methanol): 349, 258 nm (log e 4.31, 4.30)
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