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Aus den Wurzeln von Centaurea jacea L. (gemeine Flockenblume) wurde ein neues Flavonglycosid (Jaceosid) isoliert und seine Struktur als das Mono-β-D-glucopyranosid des 4′,5,6-Trihydroxy-3′,7-dimethoxyflavons (1) oder 4′,5,7-Trihydroxy-3′,6-dimethoxyflavons (2) festgelegt. Der Strukturbeweis zugunsten von 2 und dessen 7-Glucosid (3) gelang durch Synthese beider Aglucone und Kupplung von 2 mit α-Acetobromglucose nach Konigs-Knorr und Verseifung zu 3. Investigations on the Glycosides of Centaurea Jacea L., IV1). Isolation, Structure Elucidation and Synthesis of 4′,5,7-Trihydroxy-3′,6-dimethoxyflavone-7-mono-β-D-glucopyranoside (Jaceosid), a New Flavone Glyeoside from the Roots of Cenfaurea Jacea L. From the roots of centaurea jacea L. a new flavone glucoside (jaceosid) was isolated and its structure determined as the mono-β-D-glucopyranoside of 4′,5,6-trihydroxy-3′,7-dimethoxyflavone (1) or 4′,5,7-trihydroxy-.3′,6-dimethoxyflavone (2), respectively. The structure was confirmed in favor of 2 and its 7-glucoside (3) by synthesis of both aglucones and coupling of 2 with α-acetobromglucose according to Konigs-Knorr and saponification to 3.

IN Centaurea Jacea, the flower-heads of the same stem, as far as I have seen, are always of the same form, but different stems of the same locality often present astonishing difference in their flower-heads.

Two new flavonols were isolated from Centaurea jacea flowers and they have been shown to be 4′,5,7-trihydroxy-3,6-dimethoxyflavone and its 7-O-β- d -glucoside.