Novel N'-phenyl-N-methylurea derivatives of the formula: ##STR1## wherein R is a C.sub.4 -C.sub.10 cycloalkyl group, a C.sub.4 -C.sub.10 cycloalkenyl group, a C.sub.4 -C.sub.10 cycloalkyl group condensed with a benzene ring or substituted with at least one C.sub.1 -C.sub.4 alkyl group or a C.sub.4 -C.sub.10 cycloalkenyl group condensed with a benzene ring or substituted with a C.sub.1 -C.sub.4 alkyl group, Z is a C.sub.1 -C.sub.4 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 proviso that in the chain consisting of --(Z).sub.n --Y--, oxygen and/or sulfur atoms can not be present in succession, which shows a 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.
N'-苯基-N-甲基
脲类化合物的新颖衍
生物的
化学式如下:其中R为C4-C10环烷基,C4-C10环烯基,与苯环融合的C4-C10环烷基或至少一个C1-C4烷基取代的C4-C10环烷基,或与苯环融合或取代一个C1-C4烷基的C4-C10环烯基;Z为C1-C4烷基链,端部和/或碳链内可能含有氧和/或
硫原子;Y为氧原子或
硫原子;A为氢原子,甲基基团或甲氧基团;n为0或1的整数,但在--(Z)n--Y--链中,氧和/或
硫原子不得连续存在。这些衍
生物对各种杂草显示出显著的除草活性,在种植作物的过程中对哺乳动物没有显著毒性,并不会对作物造成
化学伤害。