Browsing by Author "Hailu Ayele"

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    Anthraquinones and Fla Vonolds from the Pods of S. Didymobotrya
    (Addis Ababa Universty, 1995-06) Hailu Ayele; Abegaz Berhanu (PhD)
    Two hitherto unknown dimeric anthraquinones, lO-(Physcion-Tyl)-lO-hydroxy chrysophanol anthrone (122) and 9-(Physcion-T -yI)5, lO-dihdroxy-2-methyl-l,4- anthraquinone (124) along with chrysophanol (120), physcion (121), emodin (125) and knipholone (126) were isolated from the chloroform extract of the pods of Senna didymobotrya. Knipholone (126) is isolated from the genus Senna for the first time. The methanol extract of the pods yielded three flavonoids, kaempferoI4'-methyl ether (127), acacetin (129) and 3,5,6,7,8,3' ,4'-heptahydroxy flavone (130). Their presence in the genus Senna is reported for the first time. Structural elucidations were carried by chemical and spectroscopic methods.