Abstract
Quercetagetin had been isolated as the flavonoid from the flowers of Tagetes erecta L. (Compositae) and its glycoside was obtained this time, designated as tagetiin. It was obtained in 0.1% yield as yellow needles, m.p. 203° (decomp.), [α]D10:-109.64°, C21H20O13⋅3 H2O. Hydrolysis of tagetiin affords 1 mole of querecetagetin and 1 mole of glucose. The aglycone obtained by the hydrolysis of completely methylated tagetiin comes as almost colorless needles, m.p. 220°, corresponding to quercetagetin-pentamethyl ether, but not identical with 3, 6, 7, 3′, 4′-pentamethyl ether m.p. 158-159° It is assumed that the glucose is bonded at the 3-position. Some pale yellow needles, m.p. 180-181°, were obtained in 0.7% yield from its leaves. The hydrolysis of this substance afforded 1 mole of kaempferol and 2 moles of rhamnose and was identified as kaempferitrin (lespedin or kaempferol-3, 7-dirhamnoside).
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