Abstract
Eight valencenoid derivatives were evaluated for their repelling activity against Formosan subterranean termites, Coptotermes formosanus Shiraki. Among them, 1,10-dihydronootkatone was the strongest repellent, and valencene was the weakest. Results of the structure–repellency relationships indicated (1) reduction of the ketone group to the alcohol on position 2 of nootkatone curtailed the activity; (2) because of the low activity of valencene relative to nootkatone that the ketone group was essential for repellent activity; (3) reduction of the 1,10 double bond (1,10-dihydronootkatone and tetrahydronootkatone) produced compounds more repellent than nootkatone; (4) the isopropenyl group probably does not participate in binding as evidenced by no significant difference in the repellent activity among nootkatone (double bond between position 11 and 12), isonootkatone (double bond between position 7 and 11), and 11,12-dihydronootkatone.
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Zhu, B.C.R., Henderson, G., Sauer, A.M. et al. Structure–Activity of Valencenoid Derivatives and Their Repellence to the Formosan Subterranean Termite. J Chem Ecol 29, 2695–2701 (2003). https://doi.org/10.1023/B:JOEC.0000008013.07845.4c
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DOI: https://doi.org/10.1023/B:JOEC.0000008013.07845.4c