C-Glycosylflavonoids. The chemistry of orientin and iso-orientin

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Abstract
The structures of orientin and iso-orientin have been investigated by periodic acid and ferric chloride oxidation of the tetra-O-methyl derivatives and by identification of the products of oxidation. The preparation and properties of the 3[image],4[image], 7-tri-methyl ethers of orientin and iso-orientin are described, and the nuclear-magnetic-resonance spectra of orientin, iso-orientin and their tri- and tetra-O-methyl derivatives are discussed. Orientin and iso-orientin are formulated as 8- and 6-C-/3-D-glucopyranosyl-luteolin respectively.