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Pheromones, Olfactory Receptors, Structure-response Relationships, Lepidoptera Electroantennogram (EAG) data reflecting response spectra of male pheromone receptors have been analyzed for 16 species of Noctuidae (Lepidoptera). The test compounds included 100 phero­ mone analogues, altered in chain length, in position and configuration of double bond(s), and in the functional end groups. On comparison of amounts of substance required to elicit an equivalent EAG response, a single compound was determined to be most effective on a given species; these structures, either known or proposed as the natural sex pheromones of the species, were cis-1-dodecen-1-yl acetate, cis-7-tetradecen-1-yl acetate, cts-9-tetradecen-1-yl acetate, Jrarcs-9-tetradecen-1-yl acetate, cis-ll-hexadecen-l-yl acetate, cis-9, trans-12-tetradecadien-l-yl acetate, cis-9-tetradecen-1-yl formate, and cts-9-tetradecen-1-ol, respectively. Elongation (shortening) of the chain by 1 or 2 methylene groups, the movement of a double bond 1 carbon from the optimum, a change to the opposite geometrical isomer, or the introduction of a second double bond invariably reduced EAG responses to 1.8 to 56 times below that observed with the most stimulating compound, in all 16 species. Further alterations in chain length or in double bond position caused even greater reduc­ tion in activity, as did certain changes in end group (Tables I and II).

Structure-response Relationships in Noctuid Sex Pheromone Reception An Introductory Report: An Introductory Report