Synthesis And Herbicidal Activity Of N-(4 '-Substituted Pyrimidin-2 '-Yl)2-Methoxycarbonyl-5-[(Un)Substituted Benzamido]Phenylsulfonylurea Derivatives

In order to search for ecologically-safer and environmentally-benign sulfonylurea herbicides, on the basis of study on the N-(4-methylpyrimidin-2-yl)-N' -(2-methoxycarbonyl phenylsulfonyl)urea, named monosulfuron, a commercialized herbicide invented by our laboratory, 26 novel benzenesulfonylurea compounds modified at the 5-position of the benzene ring were synthesized. The structures of all compounds synthesized were confirmed by elemental analysis, MS and H-1 NMR spectra. Herbicidal activity of the new compounds was determined by rape disc and pot bioassay experiments. The result indicated that when the substituent group at 5-position of the benzene ring was benzamide, the herbicidal activity was good compared to sulfometuron-methyl.