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Three anthocyanins were isolated from the acidified methanolic extract of blue flowers of Vicia villosa Roth (hairy vetch) by a combination of ion-exchange resin and gel filtration. Mostly on the basis of homo-and heteronuclear two-dimensional nuclear magnetic resonance techniques, their structures were elucidated to be the 3-O-R-rhamnopyranoside-5-O--glucopyranosides of petunidin (71%), delphinidin (12%), and malvidin (9%), respectively.

Die Glyoxale (IIa)‐(IIh) werden durch Oxidation der Acetophenone (Ia)‐(Ih) mit Selendioxid oder durch Bromierung von (Ia)‐(Ih), Aminierung und Verseifung der Aminale (Va)‐(Vh) erhalten.

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