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Pyrethrin is most commonly used as an insecticide and has been used for this purpose since the 1900s. [18] In the 1800s, it was known as "Persian powder", "Persian pellitory", and "zacherlin". Pyrethrins delay the closure of voltage-gated sodium channels in the nerve cells
Resistance of head lice to insecticides such as lindane, malathion, phenothrin and permethrin has been reported. [9] [10] [11] A 2021 systematic review and meta-analysis found that the mean frequency of pyrethroid resistance of lice was 77% globally, and even 100% in several countries (Australia, England, Israel, and Turkey). [12]
They are classified as pyrethroids, i.e. synthetic versions of pyrethrin, a chemical with insecticidal properties found naturally in Chrysanthemum flowers. They were first synthesized in the United States by Milton S. Schechter in 1949. Allethrin was the first pyrethroid. [1]
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Whereas pyrethrin I is a derivative of (+)-trans-chrysanthemic acid, in pyrethrin II one methyl group is oxidized to a carboxymethyl group, the resulting core being called pyrethric acid. Knowledge of their chemical structures opened the way for the production of synthetic analogues, which are called pyrethroids .
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Pyrethrin I is one of the two pyrethrins, natural organic compounds with potent insecticidal activity. It is an ester of (+)- trans - chrysanthemic acid with ( S )-( Z )- pyrethrolone . Total synthesis
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