Taxonomy: Physicochemical and Pharmacological Properties of Flavonoids – Flavons and Flavon-3-ols
Biological sources: Scutellaria rivularis [1]
C21H18O12: 462.0798
Mp: 174°C (dec.) (MeOH)
[α] 20D −75.9° (c 0.03, methanol)
UV: 279 (4.20), 336 (3.80); +CH3ONa: 258 sh (3.92), 286 (4.03), 330 (3.50), 400 (3.83); +AlCl3: 287 (4.19), 300 (4.18), 355 (3.95), 426 (3.54); +AlC3/HCl: 286 (4.20), 298 sh (4.18), 351 (3.94), 426 (3.54); +CH3COONa: 281 (4.34), 330 (4.07), 400 (3.64); +H3BO3/CH3COONa: 279 (4.35), 336 (3.7) [1]
IR: 3426 (OH), 1735 (COOH), 1663 (C = O γ-pyrone), 1620, 1585 (C = C aromatic) [1]
FAB-MS: 463 [M + 1]+ (33), 287 [C15H10O6 (aglycone) + 1] (100) [1]
1 H NMR (DMSO-d6): 3.4-4.0 (m, sugar protons), 5.18 (1H, d, J = 6.4, anomeric sugar proton, H-1″), 6.64 (1H, s, H-6), 7.14 (1H, s, H-3), 6.96-7.12 (2H, m, H-3′,5′), 7.30 (1H, ddd, J = 7.8, 7.6, 1.5, H-4′), 7.99 (1H, dd, J = 7.8, 1.5, H-6′), 8.74, 10.88 (each 1H, br s, 2xOH), 12.31 (1H, s, 5-OH) [1]
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References
T. Tomimori, Y. Imoto, Y. Miyaichi, Chem. Pharm. Bull. 38, 3488 (1990)
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(2013). 5,8,2′-Trihydroxyflavone-7-O-glucuronopyranoside. In: Azimova, S.S., Vinogradova, V.I. (eds) Natural Compounds. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-0535-1_397
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