Abstract

Permethylated O-glycosyl- C-glycosylflavones give well defined MS including an important molecular peak. Permethyl 6- C-glycosylflavones O-glycosylated on a phenolic hydroxyl group are easily distinguished from the isomeric permethyl 6- C-diholosylflavones. In both types, the position of the O-glycosidic bond can be deduced from the MS, eventually after acid hydrolysis. 2″- O-glycosyl-6- C-glycosylflavones can be differentiated from their 8- C isomers.

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