| abstract |
NEW MATERIAL:A compound expressed by formula I (R 1 is alkyl, pyridyl, thienyl or quinolyl; R 2 is alkyl or phenyl). n EXAMPLE: Methyl 3-(2-acetylamino-2,3-dimethylbutanoylaminosufonyl)thiophene- 2-carboxylate. n USE: A herbicide capable of exhibiting excellent herbicidal effects especially on broad-leaved plants with hardly any phytotoxicity to crops, such as wheat, cotton and soybean. n PREPARATION: Sulfonyl-substituted imidazolinones expressed by formula II are hydrolyzed in a solvent, such as water or ethanol, using a catalyst, such as hydrochloric acid or p-toluenesulfonic acid, at 0°CWrefluxing temperature for 3W8hr to afford the aimed compound expressed by formula I. n COPYRIGHT: (C)1989,JPO&Japio |