申请人:Mitsui Toatsu Chemicals Incorporated
公开号:US05123954A1
公开(公告)日:1992-06-23
A 3,4-cis isomer of 4-ethyl-1-(substituted phenyl)-3-substituted phenyl)pyrrolidin-2-one, when reacted with a base, can be effectively convered into a 3,4-trans isomer thereof which has a high herbicidal activity useful as an effective ingredient for a herbicidal composition. Furthermore, 3,4-trans-4-ethyl-1-(substituted phenyl)-3-(substituted phenyl)pyrrolidin-2-one compounds represented by the formula (III) ##STR1## (wherein R.sup.2 is an isopropyl group, and X is a fluorine atom, chlorine atom or bromine atom substituted at the 3-position, or fluorine atoms substituted at the 3- and 4-positions or the 3- and 5-positions) have an extremely excellent activity particularly as a herbicidally active ingredient of the herbicidal composition for rice paddy fields.
4-乙基-1-(取代苯基)-3-取代苯基)吡咯烷-2-酮的3,4-顺式异构体在与碱反应时,可以有效地转化为其3,4-反式异构体,具有高除草活性,可作为除草组合物的有效成分。此外,由下式所表示的3,4-反式-4-乙基-1-(取代苯基)-3-(取代苯基)吡咯烷-2-酮化合物(式中R.sup.2为异丙基基团,X为取代3位的氟原子、氯原子或溴原子,或取代3位和4位或3位和5位的氟原子)特别作为水稻田除草组合物的除草活性成分具有极其优异的活性。