Die Flavon-C-glykoside von Viola tricolor L. / The Flavone-C-glycosides of Viola tricolor L.

Abstract

For a flavone-di-glycoside from a garden variety of Viola tricolor L. the structure 5,7,4′-Trihydroxyflavone-6-C-β-ᴅ-glucopyranosyl-8-C-α-ʟ-rhamnopyranoside was elucidated using mainly perjodate oxidation, NMR- and mass-spectroscopy. From the same plant besides the mono-C-glucosides Vitexin, Saponaretin, Orientin and Isoorientin four Apigenin-di-C-glycosides were isolated, one of them proved to be identical with Vicenine-2.