Comparison of Sex Pheromonal Activity on the American Cockroach between Acetates and Propionates of Verbenyl Type Alcohols

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Sex pheromonal activity was evaluated for propionates of 4 alcohols having a 6, 6-dimethylbicyclo[3.1.1]heptane skeleton by behavioral assay with the male American cockroach. Their activities were compared with the corresponding acetates. The propionates were active at 20 μg or 500 μg, demonstrating stronger activities than the corresponding acetates. The male to female response ratio (M/F ratio) in BAG was also evaluated for the acetates and propionates, as well as for germacrene-D and camphor. The order of the behavioral activity was represented by that of the ratio. Sex pheromonal activity of (+)-verbanyl propionate (7) and germacrene-D were compared. Stronger activity was consequently observed in 7 at 5μg dose, supporting the M/F ratio result.