Abstract From geranylacetone and by the use of a variety of reagents, twelve analogues of the juvenile hormone III were synthesized. The compounds (5-16) have an isoprenic structure bearing at the extreme of the chain functional groups as carbonate, carbamate, thiolcarbonate, thiolcarbamate, carbonyloxyimino and thiol carbonyloxyimino. Compounds 5-9 present the normal unsaturated isoprenic chain while compounds 10-16 have a monoepoxide function. All the compounds were tested for their respective juvenile hormone activity for Triatoma infestans and Rhodniusprolixus. The most active compounds were those having a thiol carbonate group independently of the oxidation state of the molecule. The synthetic procedures and the biological results are discussed.