Abstract
This chapter focuses on naturally occurring C-glycosyl compounds, which provide useful diagnostic features. Many spectra have been recorded for the solutions of C-glycosyl compounds in methyl sulfoxide. Oxidation with potassium permanganate in acetone shows promise as a means of degrading aromatic C-glycosyl compounds to the corresponding aromatic carboxylic acids, as methoxylated aromatic rings are stable under the conditions employed. Comparison of the ultraviolet and infrared spectra of barbaloin with those of the cascarosides suggested that at least one of the phenolic groups in the barbaloin residue of the cascarosides is free. Two-dimensional chromatograms of Vitez lucens extracts show the presence of four compounds, all of which are postulated to be 6, 8-di-C-glycosyl derivatives of luteolin, differing only in the structure of the glycosyl groups and at least three compounds that are, similarly, di-C-glycosyl derivatives of apigenin.
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