No abstract

A series of compounds containing¯uorine atoms in place of hydrogen in ole®nic non-ester pyrethroids has been synthesised using a route based on novel intermediates, ie 2-¯uoroallyl acetates, which are coupled with aryl Grignard reagents, and tested against several insect species. In most cases, after introduction of¯uorine at the ole®nic position, the activity remains high in both the 1-aryl-1-(3arylprop-2-enyl)cyclopropane and the (1-aryl-4-arylbut-2-enyl)cyclopropane series. In particular, the former series have potential as soil insecticides, because in tests against Diabrotica balteata, activities were high, and dose-transferability factors were increased by the introduction of¯uorine.