| 摘要 |
Known, herbicidally active, substituted tetrahydropyrimidinone derivatives of the general formula <IMAGE> in which Ar<1> and Ar<2> are identical or different and represent optionally substituted aryl and R<1>, R<2> and R<3> represent hydrogen or lower alkyl, are obtained by a novel process by reacting N,N'-disubstituted ureas of the general formula II, <IMAGE> with 1,3-dihaloalkanes of the general formula III <IMAGE> in which Hal<1> and Hal<2> are identical or different and represent halogen, in the presence of a diluent and in the presence of a strong base and, if appropriate, in the presence of a catalyst, at temperatures between +20 DEG C and +160 DEG C.
|
