| 摘要 |
Compounds of the general formula <IMAGE> in which R1 represents hydrogen, alkyl having 1-6 carbon atoms or cycloalkyl having 3-6 carbon atoms, R2 represents hydrogen, alkyl having 1-6 carbon atoms, alkenyl having 2-6 carbon atoms or alkynyl having 2-6 carbon atoms, or R1 and R2, together with the carbon atom to which they are linked, form a cyclopentane or cyclohexane ring which can optionally be mono-, di- or trisubstituted by alkyl having 1-3 carbon atoms, and R3 represents hydrogen, halogen or nitro, with the proviso that R1 and R2 do not simultaneously denote hydrogen, and compositions and processes for their preparation, and their use in herbicides. |
