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Qu'est-ce (qui) est pyrethrin - définition
![Cyclopropanation reaction producing chrysanthemyl diphosphate, an intermediate in the biosynthesis of [[chrysanthemic acid]]](https://commons.wikimedia.org/wiki/Special:FilePath/CCPaseRxn'.png?width=200 "Cyclopropanation reaction producing chrysanthemyl diphosphate, an intermediate in the biosynthesis of [[chrysanthemic acid]]")
Wikipédia
The pyrethrins are a class of organic compounds normally derived from Chrysanthemum cinerariifolium that have potent insecticidal activity by targeting the nervous systems of insects. Pyrethrin naturally occurs in chrysanthemum flowers and is often considered an organic insecticide when it is not combined with piperonyl butoxide or other synthetic adjuvants. Their insecticidal and insect-repellent properties have been known and used for thousands of years.
Pyrethrins are gradually replacing organophosphates and organochlorides as the pesticides of choice as the latter compounds have been shown to have significant and persistent toxic effects to humans.They first appeared on markets in the 1900's and have been continually used since then in products such as bug bombs, building insect sprays, and even to spray animals so that they do not get infectious diseases
