| 摘要 |
NEW MATERIAL:A compound expressed by formula I (R<1> is alkyl, alkenyl, alkynyl, alkoxyalkyl, haloalkyl or haloalkenyl; R<2> is trifluoromethyl or pentafluoroethyl). USE:A herbicide. PREPARATION:A compound expressed by formula II is allowed to react with a compound expressed by formula III (X is I, Br, Cl, p-toluenesulfonyloxy or methanesulfonyloxy) to provide the objective quinoxaline derivative expressed by formula I. The aforementioned reaction is normally carried out in the presence of a base such as NaOH or KOH in a solvent such as hexane or heptane. The amounts of the compound expressed by formula III and the base used, based on 1 equiv. compound expressed by formula II, are 1-1.2 equiv. compound expressed by formula III and 1-1.5 equiv. base, respectively. |
