1957 年 77 巻 1 号 p. 31-33
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).