The invention relates to benzamides of formula (I), wherein Q is Q1 or Q2 orQ3 or Q4 (formulae (Q1), (Q2), (Q3), (Q4));and their use as herbicides. In said formula (I), R2 is R2c R2d NC(O)NR2n-Z2,both R4 and R5 are hydrogen, R1, R3 and R6 representgroups such as hydrogen, halogen or organic groups such as alkyl or phenyl.Theinvention further refers to a composition comprisingsuch compound and to the use thereof for controlling unwanted vegetation.