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Abstract
Several mono- and di-substituted urea pesticides were reacted with trifluoroacetic anhydride and heptafluorobutyric anhydride to determine if the procedure normally used to derivatize tri-substituted phenylureas yielded cleavage products instead of the derivatized phenylureas. Compounds studied included 4-chlorophenylurea, N-demethoxy linuron (1-[3,4-dichlorophenyl]-3-methyl urea), siduron (l-phenyl-3-[2-methyl cyclohexyl] urea, EL-494 (1-[3-{S-methyl-6-(4-brornophenyl) pyrazinyl}]-3- [2,6-dichlorophenyl] urea), and diflubenzuron (1-[4-chlorophenyl]-3-[2,6 dilurobenzoyl] urea. All compounds yielded N-perfluoroacylated cleavage products, indicating a generalized cleavage reaction for mono- and di-substituted phenylureas.