| 摘要 |
Methyl-substituted tetrahydro-2-pyrimidinone derivatives of the general formula <IMAGE> (I) in which each Ar, independently of each other, represents an aryl group which is optionally mono- or poly-substituted by substituent(s) selected from halogen, C1 to C6 alkyl, C1 to C6 alkoxy, C1 to C6 alkylthio, nitro, phenoxy and trifluoromethyl, and R1, R2 and R3 independently represent a hydrogen atom or a methyl group, provided that at least one of R1, R2 and R3 represents a methyl group, are new and find use as herbicides, in particular as selective herbicides which may be used on weeds in crops such as cotton and rice. The N,N'-diaryl-N-haloalkyl-ureas which are starting materials for the production of compounds of formula (I) are also new. |
