HERBICIDALLY ACTIVE META-CYANOALKOXY-PHENYL UREAS, THEIR PREPARATION AND COMPOSITIONS CONTAINING THEM

摘要

The m-Cyanoalkoxy-phenylureas of the formula I (I) wherein X is hydrogen or halogen, Y-O is a preferably branched-chain cyanoalkoxy group, and -NR1R2 is a primary, secondary or heterocyclic amino group, exhibit surprisingly good herbicidal activity against mono- and dicotyledonous plants, with a selective action in crops of maize, cereals, cotton and soya bean, and in the case of some of these compounds also in rape crops.