Abstract
A number of 1-citronellyl-5-substituted imidazoles were synthesized and bioassayed on the silkworm, Bombyx mori, in order to assess their anti-juvenile hormone activity. Most of the 1-citronellyl-5-substituted imidazoles induced precocious metamorphosis in the 3rd and 4th instar larvae of B. mori by topical application. The percentage of precocious metamorphosis correlated well with the dosage. Among the compounds tested, l-citronellyl-5-(2-chlorophenyl)imidazole (8) and the 2-methylphenyl analog 10 showed the highest activity. When compounds 8 and 10 were applied to the 4th instar larvae at 10 μg/larva, precocious pupation was induced in 100% without any lethal effects.
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