NOVEL HERBICIDALLY ACTIVE PHENOXY-PHENOXY-ALKANECARBOXYLIC ACID DERIVATIVES AND USE THEREOF FOR CONTROLLING GRASS-LIKE WEEDS

摘要

Process for the preparation of novel compounds of the formula I in which R1 denotes hydrogen, halogen, the trifluoromethyl or cyano group, R2 denotes hydrogen, halogen, a cyano group or lower alkyl, R3 and R4 independently of one another in each case denote hydrogen or lower alkyl, and R5 denotes a group -OH, -O-cation, -O-alkyl, -O-alkoxyalkyl, -S-alkyl, -S-alkenyl, -S-CH2-COO-alkyl, -O-alkenyl, -O-alkynyl, -O-cycloalkyl, -O-alkyl-N(dialkyl), an optionally substituted benzyloxy, phenoxy or phenylthio radical, furthermore NH2, NH-alkyl, -N(dialkyl), or The active substances of the formula I and compositions containing them are useful selective herbicides.