1-Benzoyl-3-(heterocyclic)ureas, compositions, and insecticidal method

摘要

The 1-benzoyl-3-(6-oxopyridazinyl) ureas of formula Iwherein R is chloro, fluoro or bromo, R¹ is hydrogen, chloro, fluoro or bromo, R² and R³ are independently hydrogen, chloro or bromo and R⁴ is selected from the group consisting of branched alkyl, cycloalkyl, 4-chlorophenyl, 3,5-dichlorophenyl, 4-bromophenyl, 3-trifluoromethylphenyl 3,5-bis (trifluoromethyl)phenyl, 4-chlorobenzyl and 4-methoxyphenyl, with the provisos that when R is fluoro, R¹ is other than hydrogen; that one of R² and R³ is hydrogen; that R⁴ is other than 3-trifluoromethylphenyl when R is bromo and R² and R³ are hydrogen, or when R and R³ both are chloro and R¹ is hydrogen; and that R⁴ is 4-methoxyphenyl only when R and R¹ both are chloro and R² is chloro or hydrogen have insecticidal activity against insects from the order Coleoptera and Lepidoptera.