| abstract |
A 1-arylpyrazole of the formula (I) <IMAGE> (I) in which R1 stands for hydrogen or nitro, R2 stands for hydrogen, for a radical <IMAGE> or a radical -S(O)n-R5, R3 stands for alkyl, for a radical <IMAGE> or for a radical -S(O)n-R5, and, in addition, in the case where R2 stands for a radical -SO2-R5, R3 alternatively stands for an inorganic or organic cation bonded in the manner of a salt, where R4 stands for hydrogen, alkyl, alkenyl, alkinyl, monohalogenoalkyl, alkoxyalkyl, halogenoalkoxyalkyl, alkylthioalkyl, alkoxy, alkylthio, alkylsulphonylalkyl, alkylsulphinylalkyl, alkylamino, dialkylamino, optionally substituted cycloalkyl, optionally substituted aryl, optionally substituted aryloxy, optionally substituted arylthio, or for optionally substituted arylamino, X stands for oxygen or sulphur, R5 stands for alkyl, halogenoalkyl or for optionally substituted aryl, n stands for a number 0, 1 or 2, and Ar stands for one of the radicals <IMAGE> <IMAGE> wherein A1 stands for hydrogen, fluorine or chlorine, A2 stands for fluorine or chlorine and A3 stands for hydrogen or fluorine, but excluding the compounds 5-ethoxycarbonylamino-1-(2,3-dichloro-4-trifluoromethylphenyl)-4-nitro- pyrazol and 5-acetamido-1-2,5-difluoro-4-trifluoromethylphenyl)-pyrazole. Such 1-arylpyrazoles are useful as herbicides and as plant growth-regulating agents. |