| abstract |
The invention concerns substituted 1-methyl-3-benzyluracils (I) and their salts and enol ethers as herbicides or desiccating/defoliating agents. In formula (I), R1 is C1-C4 alkyl halide; R2 is H or halogen; R3 is R2, CN, SCN, C¿1?-C4 alkyl halide, C1-C4 alkoxy halide or C1-C4 alkylthio halide; R?4 is R3, C¿1-C4 alkyl, C1-C4 alkoxy or (C1-C6 alkylamino)-CO-; R5 is R2, CN, NO¿2?, 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 α position with R5 then being in the β position, is OH, SH, alkyl, alkoxy, alkylthio, alkyl-CO¿2?-, 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 β position, with R5 then being in the α 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. |