Definition
ChEBI: (Z)-(1R)-cis-tefluthrin is a 2,3,5,6-tetrafluoro-4-methylbenzyl 3-[(1Z)-2-chloro-3,3,3-trifluoroprop-1-en-1-yl]-2,2-dimethylcyclopropanecarboxylate in which both of the stereocentres have R configuration. It is an enantiomer of a (Z)-(1S)-cis-tefluthrin.
Production Methods
Kappa tefluthrin is not produced through a unique synthetic route of its own; it is the stereochemically enriched isomer of tefluthrin, so its manufacture follows the same broad, non operational sequence used for tefluthrin technical material. The production of tefluthrin involves a multi-step organic synthesis, beginning with the preparation of cyhalothrin acid chloride, a reactive intermediate. This compound undergoes esterification with 4-methyl-2,3,5,6-tetrafluorobenzyl alcohol, forming the ester linkage that defines tefluthrin’s structure. The reaction typically requires a base catalyst and an anhydrous solvent to facilitate the nucleophilic substitution and prevent hydrolysis. Temperature control and purification steps, such as recrystallisation or chromatography, are crucial to isolate the desired product and remove by-products. kappa tefluthrin is obtained by post reaction isomer enrichment or separation, yielding the specific isomer used in pesticide products.
