Abstract: Twenty new compounds were synthesized by acylation reaction of chlorosubsti-tuted propenol with 3(2,2dichlorovinyl)₂,2-dimethylcyclopropane carbonyl chloride, 3(2,2-dimethylvinyl)2,2-dimethylcycloprepane carbonyl chloride and 2(4-chlorobenzenyl)₂isopropyl carbonyl chloride. Their structures were confirmed by means of elemetal analysis and ¹HNMR; the preliminary biological tests show that the knock down activities(KT50) against mosquito of the compounds 6 (3.9 min) and 15 (4.2 min) are higher than the compared insecticide methothrin(KT505.7 min and 4.8 min respectively), and the title compounds , when Y=H, have better insecticidal activities than which Y=CN.

Key words: Chlorosubstituted propenol, Pyrethroid, Insecticidal activities, Synthesis