PIPERAZINE COMPOUNDS HAVING HERBICIDAL ACTION

摘要

The invention relates to piperazine compounds of the following defined ge neral formula (I) and to their use as herbicides. The invention also relates to crop protection agents and to a method for combating undesired plant gro wth. In formula (I), the variables are defined as follows: R1 is selected fr om halogen, cyano, nitro, Z-C(=O)-R11, phenyl and a 5- or 6-membered heteroc yclic group that has 1, 2, 3 or 4 heteroatoms, selected from O, N and S as r ing atoms, wherein phenyl and the heterocyclic group are unsubstituted or ha ve 1, 2, 3 or 4 substituents R1a; Z stands for a covalent bond or a CH2 grou p; R11 represents hydrogen, C1-C6 alkyl, C3-C6 cycloalkyl, C2-C6 alkenyl, C5 -C6 cycloalkenyl, C2-C6 alkynyl and similar; R2 represents hydrogen, halogen , nitro, cyano, C1-C4 alkyl, C1-C4 haloalkyl, C2- C4 alkenyl, C1-C4 alkoxy, C1-C4 haloalkoxy, 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 r epresents hydrogen, C1-C4 alkyl, C3-C4 alkenyl, C3-C4 alkynyl or a group (=O )R51, wherein R51 stands for hydrogen, C1-C4 alkyl, C1-C4 haloalkyl, C1-C4 a lkoxy or C1-C4 haloalkoxy; R6 stands for C1-C4 alkyl, C1-C4 hydroxy alkyl or C1-C4 haloalkyl; 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-C4alkoxy and C1-C4 haloalk oxy.