3. New modes of action
From 1972 onwards, it wasn't enough for a product to be active to attract the interest of an increasingly crowded market; it had to offer something genuinely new to crop protection, compared with the substances currently in use.
3.1 Pyrethroids: the need to separate diastereomers
From 1974 onwards, pyrethroid insecticides were developed; these are esters built on the model of pyrethrum compounds, but made photostable by structural modifications (replacement of the two vinyl methyls of chrysanthemic acid by halogens and choice of a phenoxyphenyl for the alcoholic copula).
The leading molecule is deltamethrin:
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New modes of action
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