PREPARATION OF GEOMETRICAL-ISOMERS OF 2,7-DODECADIENAL, 2,7-DODECADIENYL FORMATE, AND OTHER 1,6-DIENE SYSTEM-CONTAINING COMPOUNDS AND THEIRELECTROANTENNOGRAPHY ACTIVITIES TOWARD MALE ERI-SILK MOTHS

We measured the electroantennography (EAG) activities of the geometric al isomers of several pheromone-related compounds towards male eri-sil k moths (Samia cynthia richini) using EAG-gas chromatography (GC). C-1 6-aldehyde and formyl ester, with the same chain length as C-16-aldehy de, mere found to be much more active than other compounds with a shor ter chain, For the compounds with (1Z,6Z)- or (1E,6E)-configuration, t he activity in decreasing order was C-14-formyl ester > C-16-aldehyde > C-14-aldehyde > C-12-formyl ester, while that for the compounds with (1Z,6E)- or (1E,6Z)-configuration is C-16-aldehyde > C-14-formyl este r > other compounds with a shorter C-14 chain.