| abstract |
Herbicidally active 1-substituted pyrazolidindiones of general formula (I), wherein A and B, which may be the same or different, each independently represents N or CR4; R1 represents an optionally substituted alkyl, alkenyl, alkynyl, cycloalkyl, aryl or aralkyl group; R?2, R3, and R4¿, which may be the same or different, each independently represents a hydrogen or halogen atom, a formyl, carboxy, azido, cyano or nitro group, an optionally substituted alkoxy, alkylthio, alkenyloxy, alkenylthio, alkynyloxy, alkynylthio, cycloalkoxy, cycloalkylthio, alkylcarbonyl, alkoxycarbonyl, amino alkylamino or dialkylamino group, or one of the meanings given for R1; together with salts of such compounds, and tautomers thereof. |