AbstractTwo analogues of the aphid alarm pheromone (E)‐β‐farnesene, a trifluorofarnesene and a difluoro‐1‐norfarnesene, were found to be highly active and were more readily detectable than the parent compound. For (Z)‐hexadec‐11‐enal, a component of some lepidopteran sex attractant pheromones, replacement of the carbonyl oxygen with a difluoromethyl group to give a difluoroheptadecadiene resulted in loss of activity. A trifluoroacetoxyhexadecanolide was a more volatile analogue of the mosquito oviposition pheromone (−)‐(5R,6S)‐6‐acetoxy‐5‐hexadecano
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