UREA DERIVATIVE AND SELECTIVE HERBICIDE CONTAINING SAID DERIVATIVE AS ACTIVE COMPONENT

摘要

NEW MATERIAL:The 1,3-dibenzylurea derivative of formula I (X and Y are H, halogen, lower alkyl or lower alkoxy; R1 is methyl or ethyl; R2 and R3 are H, lower or alkyl; R4 and R5 are H, methyl or ethyl; m and n are 1 or 2; at least one of R2 and R3 is H, and R4 and R5 are not methyl at the same time). EXAMPLE:3-(2-Methyl-alpha-ethyl-alpha-methylbenzyl)-1-(alpha-ethyl-alp ha-methyl-benzyl)urea. USE:Selective herbicide having excellent activity especially against cyperaceous weeds. PROCESS:The compound of formula I can be prepared by the thermal reaction of the isocyanate of formula II with the amine of formula III in a solvent such as benzene, tetrahydrofuran, etc. at room temperature -50 deg.C for 1-8hr.