Preparation of Geometrical Isomers of 2, 7-Dodecadienal, 2, 7-Dodecadienyl Formate, and Other 1, 6-Diene System-containing Compounds and Their Electroantennography Activities toward Male Eri-Silk Moths

Abstract

We measured the electroantennography (EAG) activities of the geometrical isomers of several pheromone-related compounds towards male eri-silk moths (Samia cynthia richini) using EAG-gas chromatography (GC). C₁₆-aldehyde and formyl ester, with the same chain length as C₁₆-aldehyde, were found to be much more active than other compounds with a shorter chain. For the compounds with (1Z, 6Z)- or (1E, 6E)-contiguration, the activity in decreasing order was C₁₄-formyl ester > C ₁₆-aldehyde > C ₁₄-aldehyde>C₁₂-formyl ester, while that for the compounds with (1Z, 6E)- or (1E, 6Z)-configuration is C₁₆-aldehyde > C₁₄-formyl ester > other compounds with a shorter C₁₄ chain.