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Communication | Special issue | Vol 17, No. 1, 1982, pp.67-71
Published online, 1st January, 1970
DOI: 10.3987/S-1982-01-0067
A Southern Army-Worm Antifeedant, 12β-Acetoxyharrisonin from an African Shrub Harrisonia Abyssinica

Hung-wen Liu, Isao Kubo, and Koji Nakanishi*

*Department of Chemistry, Columbia University, 3000 Broadway, Mail Code 3114, New York, New York 10027, U.S.A.


The ether extract of Harrisonia abyssinica has yielded the limonoid 12β-acetoxyharrisonin 3 in addition to the known obacunone 1 and harrisonin 2. The two insect antifeedants (against Spodoptera), harrisonin and its 12β-acetoxy derivative, both possess a 6-keto-7-hemiketal moiety, which is not an artefact, and adopt a boat conformation for ring A; this aspect contrasts with that of obacunone which is not an army-worm antifeedant.