申请人:Mitsui Toatsu Chemicals, Inc.
公开号:US05114466A1
公开(公告)日:1992-05-19
1-(3-Substituted benzyl)-3-halogeno-4-(1-halogenoalkyl)-2-pyrrolidinones of the general formula (I): ##STR1## where X represents a hydrogen atom or halogen atom, Y and Z each represents a chlorine atom or bromine atom, and R represents an alkyl group with 2 to 4 carbon atoms, are herbicides useful in rice paddy fields to control weeds therein, especially Echinochloa crusgalli and can be produced subjecting the corresponding 3-dihalogeno compounds to dehalogenation to remove one of the halogen atoms or by cyclizing a 2,2-dihalogenoacetamide derivative represented by the general formula (II) under the presence of an appropriate catalyst; ##STR2## in which X, Y, Z and R respectively have the same meanings as described above.
通式(I)中,1-(3-取代苯基)-3-卤代-4-(1-卤代烷基)-2-吡咯酮,其中X代表氢原子或卤素原子,Y和Z分别代表氯原子或溴原子,R代表2至4个碳原子的烷基。这些除草剂可用于水稻田中控制杂草,尤其是谷子草,可通过将相应的3-二卤代化合物脱卤素去除其中的一个卤素原子或在适当催化剂的存在下将通式(II)所表示的2,2-二卤代乙酰胺衍生物环化而制得;其中X、Y、Z和R分别具有上述相同的含义。