Synthesis and insecticidal activity of novel 1,3,4-oxadiazolin-5-one and pyrazolin-5-one derivatives
1999
Yagi, K. | Numata, A. | Mimori, N. | Miyake, T. | Arai, K. | Ishii, S.
A series of novel 2-(2,4,6-trisubstituted phenyl)-1,3,4-oxadiazolin-5-one derivatives and 3-(2,4,6-trichlorophenyl)pyrazolin-5-one derivatives were synthesized and evaluated for insecticidal activity. It was found that a moderately bulky alkyl group, such as a tert-butyl group, on the heretocyclic ring, and a triflouromethyl group on the benezene ring were optimal substituents on the molecule. The oxygen atom in the oxadiazoline ring was essential for insecticidal activity. Of the compounds assayed, 4-tert-butyl-2-(2,6-dichloro-4-trifluoromethylphenyl)-1, 3,4-oxadiazolin-5-one gave the highest activity against Nephtotettix cincticeps, with an LC(50) value of 0.51 mg litre-1.
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