| abstract |
Pyridylsulphonylureas of the formula (I) and salts thereof <IMAGE> in which R<1>, R<2>, R<3>, R<4> A and n are as defined in Claim 1 are suitable for the selective control of noxious plants or as growth regulators in crops of useful plants. The compounds (I) can be prepared analogously to known processes (see Claim 4) via intermediates of the formulae benzenesulphonamide (II), carbamate (IV), sulphonyl isocyanates (VI), some of these intermediates being new, by reaction with carbamates (III) or amines (V), the formulae (II)-(VI) being as defined in Claim 4. |