5,7-Dimethoxy flavones

Trihydroxy-7,8-dimethoxy flavone (thymusin) 6-Isobutyrate Asarina procumhens aerial parts Scrophulariaceae 140... [Pg.757]

Trihydroxy-6,7-dimethoxy flavone (isothymusin) 8-Glucoside Becium grandiflorum leaves Labiatae 141... [Pg.757]

Kaempferol glycoside (3,5,7,4 -tetrahydroxyflavone glycoside) Limocitrin 3-3-D-glucoslde (3,5,7,4 -tetrahydroxy-8,3 -dimethoxy-flavone 3-3-D glucoside)... [Pg.50]

Hydroxylation at C-6 produces a larger bathochromic shift than hydroxylation at C-8. Moreover, the ratio of absorbance band I/absor-bance band II constitutes a criterion for distinguishing the substituted position on the Aring. Thus, 8-substitution particularly decreases this value whereas 6-substitution increasesit (Barberan et ah, 1985). Useful information to differentiate among 5,6- and 5,8-dihydroxyflavones, 3-methoxyflavones and flavonols trisubstituted on the Aring, as well as 5,6-dihydroxy-7,8-dimethoxy- and 5,8-dihydroxy-6,7-dimethoxy-flavones can be gained by comparison of their UV spectra in methanol (Barberan et ah, 1985). [Pg.226]

Since ancient times, the roots of Scutellaria baicalensis have been used to treat allergic and inflammatory diseases in China and Japan. We reported the isolation from these roots of three new compounds, i.e., 2 S), 2, 5,6, 7-tetetahydroxy flavanone[25], 2 R), 3(i )-2, 3,5,6, 7-pentahydroxyflavanone and 2, 5,5, 7-tetrahydroxy-6, 8-dimethoxy-flavone, as antibacterial or anti-lipid peroxidation substances [26, 27], as well as six flavonoids, i.e., baicalein, bailcalin, oroxylin A, wogonin, skullcapflavone II, etc. Furthermore, we found that baicalein and baicalin "Fig. (47)" suppressed the development of secondary lesions in adjuvant-induced arthritis in rats "Fig. (48)". [Pg.431]

Also by degradation of Gnaphaliin monomethyl ether (SM) (m.p. 176-178°) (5-hydroxy-3,7,8-trimethoxyflavone) with 10% ethanoUc potassium hydroxide for 2 h under nitrogen. SM was prepared by partial methylation of Gnaphaliin (m.p. 174-175°) (3,5-dihydroxy-7,8-dimethoxy-flavone), itself isolated from the aerial parts of Gnaphalium obtusifolium [4949]. [Pg.1332]

From Eupalitin triethyl ether (m.p. 80-81°) (3,5,4 -triethoxy-6,7-dimethoxy-flavone) (88%) [5008] ... [Pg.1350]

L)ihydroxy-7,4 -dimethoxy-flavone (Luteolin 7,4 -dimethyl ether = Pilloin) Notholaena fendleri Kze. C17H14O6 124 ... [Pg.127]

Dihydroxy-6,7-dimethoxy-flavone (Scutellarein 6,7-dimethyl ether = Cirsimaritin) Notholaena rigida Davenp. C17H14O6 255 119 ... [Pg.127]

Acetoxy- 5-hydroxy- 3,7-dimethoxy-flavone (Isognaphalin 8-acetate) Notholaena Candida Hook. var. Candida C19H16O7 224 246 134... [Pg.130]

Dihydroxy-3,7-dimethoxy-flavone (Kaempferol 3,7-dimethyl ether = Kumatakenin) (185) 123 ... [Pg.237]

Trihydroxy-3,7-dimethoxy-flavone (Quercetin 3,7-dimethyl ether) (198) 122,127... [Pg.243]

Dihydroxy-3,4 -dimethoxy-flavone (Kaempferol 3,4 -dimethyl ether) (184) 81... [Pg.249]

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