DESIGN, SYNTHESES AND BIOLOGICAL-ACTIVITY OF NOVEL HERBICIDES TARGETED ALS (III) - CRYSTAL AND MOLECULAR-STRUCTURE OF NYL)-1,2,4-TRIAZOLO[1,5-A]PYRIMIDINE-2-SULFONAMIDE

The title compound was synthesized and analysed by X-ray diffraction. The difference of ortho-substituents resulted in the great difference in conformation and their herbicidal activity. Compared with the cryst al structures of herbicidal sulfonurea, the same structure-activity re lationship as that of sulfonurea can be found in sulfonamides, which i ndicated that this two kinds of herbicides might have the same binding site on ALS.