Resmethrin


Resmethrin is a pyrethroid insecticide with many uses, including control of the adult mosquito population.
The resmethrin molecule has four stereoisomers determined by cis-trans orientation around a carbon triangle and chirality. Technical resmethrin is a mixture of -, -, -, and - isomers, typically in a ratio of 4:1:4:1. The 1R isomers show strong insecticidal activity, while the 1S isomers do not. The - isomer is also known as bioresmethrin,-trans-resmethrin, or d-trans-resmethrin; although bioresmethrin has been used alone as a pesticide active ingredient, it is not now registered as a separate active ingredient by the U.S. EPA. The - isomer is known as cismethrin, but this is also not registered in the U.S. for use alone as a pesticide AI.
Commercial trade names for products that contain resmethrin are Chrysron, Crossfire, Pynosect, Raid Flying Insect Killer, Scourge, Sun-Bugger #4, SPB-1382, Synthrin, Syntox, Vectrin, and Whitmire PT-110.