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. 2019 Nov 20;44(4):215–224. doi: 10.1584/jpestics.D19-102

Fig. 2. Structural modification tree of pyrethroids. Most synthetic pyrethroids contain asymmetric carbons in their structures, and their insecticidal actions are very stereospecific. Commercialized products are either isomer mixtures, a single isomer, or various product specifications. In many cases, they have been replaced by a resolved form (chiral switch). Only the most important isomers are shown here. Generally, both cis- and trans-isomers on the cyclopropane ring are insecticidal, but cis-isomers are preferred in agricultural use and trans-isomers are preferred in household use; however, there are some exceptions.

Fig. 2. Structural modification tree of pyrethroids. Most synthetic pyrethroids contain asymmetric carbons in their structures, and their insecticidal actions are very stereospecific. Commercialized products are either isomer mixtures, a single isomer, or various product specifications. In many cases, they have been replaced by a resolved form (chiral switch). Only the most important isomers are shown here. Generally, both cis- and trans-isomers on the cyclopropane ring are insecticidal, but cis-isomers are preferred in agricultural use and trans-isomers are preferred in household use; however, there are some exceptions.