Herbicidal sulfonylureas, their preparation and use

摘要

Sulfonylureas of the general formula IwhereR1 is a methyl or ethyl group;R2 is C1-C3-alkoxycarbonyl, a C1-C2-alkyl group which carries 1 to 5 fluorine atoms, methylsulfonyl, dimethylaminosulfonyl, thiomethyl, methylsulfinyl, methylsulfonyloxy, trifluoromethoxy, difluoromethoxy, difluorochloromethoxy, difluorochloromethyl or nitro;R3 is hydrogen, methyl, methoxy, ethoxy, fluorine, chlorine or thiomethyl;W is hydrogen or chlorine andZ is CH or Nand their agriculturally utilizable salts are described.