Abstract
From an examination of the nuclear
magnetic resonance spectra, optical rotations, and other properties of a number
of flavonoid C-glycosides, their acetates, and related model compounds, it is
concluded that vitexin, bayin, puerarin, and isohemiphloin are C-β-D-glucosides
with the sugar substituent in the 8-position of the flavonoid nucleus.
Hemiphloin and saponaretin are two of the corresponding 6-substituted
compounds. In hemiphloin and isohemiphloin the phenyl B ring has the equatorial
configuration.
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