3- Phenoxybenzyl methylbutyric acid

Fenvalerate is not significantly absorbed or translocated in plants. Cotton, apples, and lettuce treated with fenvalerate contained surface residues of parent fenvalerate 8 weeks after treatment (Reed 1981). In addition to the parent compound, which accounted for 80% of all residues, identified metabolites included 3-phenoxybenzaldehyde, 3-phenoxybenzyl methylbutyric acid, and conjugates of these compounds. Half-time persistence of fenvalerate on plant surfaces is between 2 and 4 weeks, and degradation is primarily a result of weathering (Reed 1981). 

Synthetic pyrethroids are esters of specific acids (chrysantemic acid, halo-substituted chrysantemic acid, 2-[4-chlorophenyl]-3-methylbutyric acid) and alcohols (allethrone, 3-phenoxybenzyl alcohol) (Ray, 1991). They represent a group of insecticides largely used in agriculture and public health because of their relatively low toxicity to humans and mammalian species and their short environmental persistence. 

The first significant success in creating a photostabilized pyrethroid with high insecticidal activity was achieved through use of the 3-phenoxybenzyl alcohol moiety. A further step was the finding that 2-aryl-3-methylbutyric acid esters of pyrethroid alcohols were both photostable and... 

Chemical name (F S)-a-cyano-3-phenoxybenzyl(F S)-2-(4-chlorophenyl)-3-methylbutyrate cyano(3-phenoxyphenyl) methyl 4-chloro-a-(1-methylethyl) benzeneacetate a-cyano-3-phenoxybenzyl 2-(4-chlorophenyl)-3-methylbutyrate 4-chloro-a-(1 -methylethyl) benzeneacetic acid cyano(3-phenoxyphenyl) methyl ester a-cyano-3-phenoxybenzyl a-(4-chlorophenyl) isovalerate... 

A Alpha Asana Asana XL Benzeneacetic acid, 4-chloro-a-(1-methylethyl)-, cyano(3-phenoxyphenyl)methyl ester, (S-(R, R ))- BRN 4275674 Cyano-3-phenoxybenzyl (S)-2-(4-chlorophenyl)isovalerate Cyano-3-phenoxybenzyl (S)-2-(4-chlorophenyl)-3-methylbutyrate (S-(R ,R ))-cyano(3-... 

C. (25 )-a-cyano-3-phenoxybenzyl (a/ )-2-4-chlorophenyl-3-methylbutyrate. The 25, aR isomer has markedly reduced insecticidal activity when compared with the 25, aS isomer, but is greatly elevated in this respect when compared with fenvalerate stereoisomers with an R configuration in the acid moiety, that is, the 2R, aS, and the 2R, aR isomers. 

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