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All four possible stereoisomers of ethyl 3,7,11-trihouse fly (Musca domestica), pea aphid (Acyrthmethyl-2,4-dodecadienoate have been syntheosiphon pisum), and tobacco budworm (Heliothis sized. Bioassay data on yellow fever mosquito virescens) for these and some related compounds (Aedes aegypti), greater wax moth (Galleria melare given. The 2E,4E stereoisomer 1 is the most lonella), yellow mealworm (Tenebrio molitor), biologically active of the four isomers.We have recently described (Henrick et al., 1973) a new class of highly potent insect growth regulators (IGRs) with juvenile hormone activity, the alkyl, 3,7,11-trimethyl-2,4-dodecadienoates. We wish to describe here the preparation of the 4 2 stereoisomers, the properties of the four stereoisomers of ethyl 3,7,11-trimethyl-2,4-dodecadienoate, and some bioassay data for these and for some closely related compounds.

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