ACYLATED C-GLYCOSIDES OF Iris lactea

Article abstract of DOI:10.1007/BF00580064

From the epigeal part of Iris lactea two acylated C-glycosylflavones not described in the literature have been isolated.On the basis of chemical transformations, and the results of UV, IR, and NMR spectroscopy, the following structures hyve been established for them: substance (I) - 5-hydroxy-4',7-dimethoxyflavone 6-C-2)-x-acetyl-β-D-glucopyranoside> (diacetylembinin); substance (II) - 5-hydroxy-4',7-dimethoxyflavone 6-C-2)-D-glucopyranoside> (acetylembinin).The existence of rotamers for 6-C-glucoflavones has been established for the first time.