| abstract |
A 5-Acylamino-pyrazole derivatives of the formula <IMAGE> in which R1 represents hydrogen, halogen or nitro, R2 represents hydrogen, alkyl, alkenyl, alkinyl or optionally substituted cycloalkyl, R3 represents hydrogen or alkyl, R4 represents hydrogen or alkyl, X represents oxygen or sulphur, n represents the integer 0, 1 or 2, Ar represents in each case optionally substituted phenyl or pyridyl and Het represents an optionally substituted 5- or 6- membered heterocyclic radical linked via a carbon atom, which exhibit herbicidal and plant growth regulating activity. |