| 摘要 |
The invention concerns substituted 1-methyl-3-benzyluracils (I) and their salts and enol ethers as herbicides or desiccating/defoliating agents. In formula (I), R<1> is C1-C4 alkyl halide; R<2> is H or halogen; R<3> is R<2>, CN, SCN, C1-C4 alkyl halide, C1-C4 alkoxy halide or C1-C4 alkylthio halide; R<4> is R<3>, C1-C4 alkyl, C1-C4 alkoxy or (C1-C6 alkylamino)-CO-; R<5> is R<2>, CN, NO2, OH, optionally substituted amino, alkoxy, alkylthio, alkyl-CO2-, alkyl-COS-, alkyl-SO2-O- or alkyl-SO2-, the six last-mentioned groups optionally being functionalized and/or substituted; R<6>, if it is in the alpha position with R<5> then being in the beta position, is OH, SH, alkyl, alkoxy, alkylthio, alkyl-CO2-, alkyl-COS-, alkoxy-CO-, alkoxy-CO2-, alkyl-SO2-O-, alkyl-SO2-, alkyl-CO-, alkyl-CS-, alkyl-(N-alkyl)-imino or alkyl-(N-alkoxy)-imino, the thirteen last-mentioned groups optionally being functionalized and/or substituted, or methyl substituted twice by optionally substituted alkoxy and alkylthio and optionally substituted once by alkyl; or R<6> in the beta position, with R<5> then being in the alpha position, has the above meanings, as well as alkyl-amino-CO-, alkoxy-CO-, alkylthio-CO-, alkyl-CO-, alkylimino-oxycarbonyl, alkyl-(N-alkoxy)-imino, alkoxy-(N-alkoxy)-imino or alkylthio-(N-alkoxy)-imino, the eight last-mentioned groups optionally being functionalized and/or substituted, or methyl substituted three times by optionally substituted alkoxy, alkylthio and alkylamino. |
