Microdetermination of bioethanomethrin

A microanalytical method was developed for the determination of the experimental synthetic pyrethroid insecticide Bioethanomethrin ((5-benzyl-3-furyl) methyl trans-(+)-3-(cyclopentylidenemethyl) -2,2-dimethylcyclopropanecarboxylate). After saponification, trichloroacetyl chloride is used to form an ester from the acid moiety. Infrared and mass spectral data support the expected structures of the derivatives formed. Nanogram sensitivity is realized by utilizing a gas chromatograph with an electron capture detector.