Abstract
Permethylated 6- C-diglycosyl-8- C-glycosylflavones and 6- C-glycosyl-8- C-diglycosylflavones gave well defined EIMS including the molecular peak and a fragmentation pattern characteristic of the 6- C-glycosyl residue. X″′- O-glycosides (8- C-disaccharides) are thus easily distinguished from X″- O-glycosides (6- C-disaccharides) and, in the latter, the position of the O-glycosidic bond should be deduced from the MS, after acid hydrolysis. Three new C-glycosylflavones have been characterized in this way from Spergularia rubra and Stellaria holostea.
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