N'-Phenyl-N-methylurea derivatives, processes for their preparation and their uses as herbicides.

摘要

Novel N min -phenyl-N-methylurea derivatives of the formula:
<CHEM>
wherein R is a C4-C10 cycloalkyl group, a C4-C10 cycloalkenyl group, a C4-C10 cycloalkyl group condensed with a benzene ring or substituted with at least one C1-C4 alkyl group or a C4-C10 cycloalkenyl group condensed with a benzene ring or substituted with a C1-C4 alkyl group, Z is a C1-C4 alkylene group which may have an atom of oxygen and/or sulfur at the terminal of and/or inside the carbon chain, Y is an oxygen atom or a sulfur atom, A is a hydrogen atom, a methyl group or a methoxy group and n is an integer of 0 or 1 with the profiso that in the chain consisting of -(Z)n-Y-, oxygen and/or sulfur atoms can not be present in succession, are described, which show pronounced herbicidal activity against a wide variety of weeds in the cultivation of crop plants without any material toxicity to mammals and any chemical injury to said crop plants. The preparation of the compounds and intermediates therefor and the herbicidal activity of the compounds are described and exemplified.