PIPERAZINE COMPOUNDS WITH A HERBICIDAL ACTION

摘要

The invention relates to piperazine compounds of the following defined general formula (I) and to their use as herbicides. The invention also relates to crop protection agents and to a method for combating undesired plant growth. In formula (I): R1 is selected from halogen, cyano, nitro, Z-C(=O)-R12, phenyl and a 5- or 6-membered heterocyclic group that has 1, 2, 3 or 4 heteroatoms, selected from O, N and S as ring atoms, wherein phenyl and the heterocyclic group are unsubstituted or have 1, 2, 3 or 4 substituents R1a; Z stands for a covalent bond or a CH2 group; R12 represents hydrogen, C1-C6 alkyl, C3-C6 cycloalkyl, C2-C6alkenyl, C5-C6 cycloalkenyl, C2-C6alkynyl and similar; R2 represents hydrogen, halogen, nitro, cyano, C1-C4alkyl, C1-C4 haloalkyl, C2- C4 alkenyl, C1-C4 alkoxy, C1-C4haloalkoxy, benzyl or a group S(O) nR21, wherein R21 stands for C1-C4 alkyl or C1-C4 haloalkyl and n stands for 0, 1 or 2; R3 represents hydrogen or halogen; R4 represents C1-C4 alkyl, C3- C4 alkenyl or C3-C4 alkynyl; R5 represents hydrogen, C1-C4alkyl, C3-C4 alkenyl, C3-C4 alkynyl or a group (=O)R51, wherein R51 stands for hydrogen, C1-C4alkyl, C1-C4 haloalkyl, C1-C4 alkoxy or C1-C4 haloalkoxy; R6 stands for C1-C4alkyl, C1-C4 hydroxy alkyl or C1-C4haloalkyl; R7, R8 stand, independently of one another, for hydrogen, OH, C1-C4 alkoxy, C1-C4 haloalkyoxy, C1-C4 alkyl or C1-C4 haloalkyl; R9, R10 are selected, independently of one another, from hydrogen, halogen, CN, NO2, C1-C4 alkyl, C1-C4 haloalkyl, C2-C4 alkenyl, C1-C4 alkoxy and C1-C4 haloalkoxy; and R11 represents hydrogen or C1-C4 alkyl. The invention also relates to the agriculturally suitable salts of said compounds.