SYNTHESIS AND CHARACTERIZATION OF THE 4 GEOMETRICAL-ISOMERS OF 3,5-DODECADIENYL ACETATE

Practical convergent syntheses of the four geometrical isomers of 3,5- dodecadienyl acetate are presented. These substances have been charact erized by NMR and mass spectroscopy. (3E,5Z)-3,5-Dodecadienyl acetate is the main female sex pheromone component of the leaf roller Bonagota cranaodes, which is an important insect pest in apples in South Ameri ca. The isomeric 3,5-dodecadienyl acetates, as pure isomers and in def ined mixtures, have been used as trap lures for Eying insects in field screening experiments in Lithuania. Although no insects were found in the control traps, the numbers of males caught in the baited traps we re not high enough to be statistically significant.