Phenoxyphenoxypropionic acid derivatives, their preparation, and their use in crop protection

摘要

Compounds of the formula <IMAGE> in which R<1> and R<2> represent halogen or CF3, R<3> represents H or halogen, R<4> represents H, halogen, NO2 or CN, R<5> represents H or alkyl, R<6> represents H, alkyl or (if R<5> = H) an acyl, carboxylate, carbamoyl or (thio)phosphonate group, X represents, in particular, O or S and R<7> represents, in particular, alkyl, are effective selective herbicides.