Aphid alarm pheromones structures

Bowers, W. S., Nishino, C., Montgomery, M. E. and Nault, L. R. (1977a) Structure-activity relationships of analogs of the aphid alarm pheromone, ( )-p-farnesene. J, Insect Physiol, 23, 697-701. 

Several aphid apecies of economic importance use ( )-P-farnesene as an alarm pheromone 304—307). Bowers et al. 308) have studied the activity of various famesene and nor-famesene analogs in an attempt to define the structural requirements necessary for alarm activity. They concluded that the following properties were important 1) there should be an JE -configurational double bond in the central position of the molecule, 2) the double bond in the terminal isoprene unit acts as an activator, 3) a rt-bond of 1.34 to 1.39 A must be located ten carbon... 

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