Eingegangen am 2. Mai 1980Herrn Prof. Dr. S. Beckmann zum 75. Geburtstag gewidmet.Aus dem Samenol von Azadirachta indica A. Juss (Meliaceae) wurden die drei neuen Tetranortriterpenoide 3-Desacetylsalannin (1 a), Salannol (2), und 1,3-Diacetylvilasinin (3a) isoliert, die insektenfraahemrnende Wirkung zeigen; ihre Strukturen wurden insbesondere aus den NMR-Spektren abgeleitet.
Novel Tetranortriterpenoids with Insect Antifeeding Activity from Neem OilFrom the seed oil of Azadiruchtu indica A. Juss (Meliaceae) three novel tetranortriterpenoids, 3-deacetylsalannin (la), salannol (2), and 1,3-diacetylvilasinin (3a), which show antifeeding activity towards insects, have been isolated, the structures of which have been determined particularly by NMR-spectroscopy.
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