Compounds of the general formula or salts thereof in which R 1 is hydrogen, halogen, cyano, nitro, (C 1 -C 6)alkyl, (C 2 - C 6) alkenyl, (C 2 -C 6) alkynyl, (C 3 - C 8) cycloalkyl, (C 3 -C 8)cycloalkenyl, (C 1 -C 6) alkoxy and (C 1 -C 6) alkyls p, where the latter seven radicals are unsubstituted or are substituted by one or more radicals from the group of halogen, cyano, (C 1 -C 6) alkoxy and (C 1 -C 6) alkylS p, R 2 is heteroaryl, where the heteroaryl radical is unsubstituted or substituted by halogen, cyano, nitro, (C 1 -C 6)alkyl, (C 2 -C 6)alkenyl, (C 2 -C 6)alkynyl, (C 3 -C 8)cycloalkyl, (C 3 -C 8)cycloalkenyl, (C 1 -C 6)alkoxy and (C 1 -C 6)alkylS p, where the latter seven radicals are unsubstituted or are substituted by one or more radicals from the group of halogen, cyano, (C 1 -C 6)alkoxy and (C 1 -C 6) alkylS p, R 3 is hydrogen and (C 1 -C 6)alkyl, R 4 is hydrogen, (C 1 -C 18)alkyl, (C 1 -C 18)haloalkyl, (C 1 -C 18) cyanoalkyl, (C 2 - C 18) alkenyl, (C 2 - C 18) alkynyl, (C 3 -C 12) cycloalkyl, (C 3 -C 12) cycloalkenyl, aryl, heteroaryl, (C 1 -C 18)alkoxy-(C 1 -C 18)alkyl, (C 1 -C 18)haloalkoxy-(C 1 -C 18)alkyl, (C 1 -C 18)alkoxy-(C 1 -C 18)haloalkyl, (C 1 -C 18)alkylthio-(C 1 -C 18)alkyl, (C 1 -C 18)haloalkylthio- (C 1 -C 18)alkyl, (C 2 -C 18)haloalkenyl, (C 2 -C 18)haloalkynyl, heterocyclyl-(C 1 -C 18)alkyl, aryl-(C 1 -C 18)alkyl, (C 3 -C 12)cycloalkyl-(C 1 -C 18)alkyl, (C 1 -C 18)alkoxycarbonyl-(C 1 -C 18)alkyl, and (C 1 -C 18)alkoxycarbonyl-(C 3 -C 12)cycloalkyl-(C 1 -C 18)alkyl, or a radical of the formula -NR a R b or - N=CR c R d, where, in the former 2 radicals, each of the R a, R b, R c and R d radicals is independently hydrogen, (C 1 -C 4)alkyl, (C 2 -C 4)alkenyl, (C 2 -C 4)alkynyl, benzyl, substituted benzyl, phenyl or substituted phenyl, or R a and R b together with the nitrogen atom may form a 3- to 8-membered heterocycle which may contain one or two further ring heteroatoms from the group of N, O and S, but not in the case of a 3- or 4-membered heterocycle, and which is unsubstituted or substituted by one or more radicals from the group of (C 1 -C 4)alkyl and (C 1 -C 4)haloalkyl, or R c and R d together with the carbon atom are a 3- to 8-membered carbocyclic or heterocyclic radical which may contain 1 to 3 ring heteroatoms from the group of N, O and S, where the carbocyclic or heterocyclic radical is unsubstituted or substituted by one or more radicals from the group of (C 1 -C 4)-alkyl and (C 1 -C 4)-haloalkyl, n is a number from 0 to 5, and p is 0, 1 or 2. R 1 is hydrogen, halogen, cyano, nitro, (C 1 -C 6)alkyl, (C 2 - C 6) alkenyl, (C 2 -C 6) alkynyl, (C 3 - C 8) cycloalkyl, (C 3 -C 8)cycloalkenyl, (C 1 -C 6) alkoxy and (C 1 -C 6) alkyls p, where the latter seven radicals are unsubstituted or are substituted by one or more radicals from the group of halogen, cyano, (C 1 -C 6) alkoxy and (C 1 -C 6) alkylS p, R 2 is heteroaryl, where the heteroaryl radical is unsubstituted or substituted by halogen, cyano, nitro, (C 1 -C 6)alkyl, (C 2 -C 6)alkenyl, (C 2 -C 6)alkynyl, (C 3 -C 8)cycloalkyl, (C 3 -C 8)cycloalkenyl, (C 1 -C 6)alkoxy and (C 1 -C 6)alkylS p, where the latter seven radicals are unsubstituted or are substituted by one or more radicals from the group of halogen, cyano, (C 1 -C 6)alkoxy and (C 1 -C 6) alkylS p, R 3 is hydrogen and (C 1 -C 6)alkyl, R 4 is hydrogen, (C 1 -C 18)alkyl, (C 1 -C 18)haloalkyl, (C 1 -C 18) cyanoalkyl, (C 2 - C 18) alkenyl, (C 2 - C 18) alkynyl, (C 3 -C 12) cycloalkyl, (C 3 -C 12) cycloalkenyl, aryl, heteroaryl, (C 1 -C 18)alkoxy-(C 1 -C 18)alkyl, (C 1 -C 18)haloalkoxy-(C 1 -C 18)alkyl, (C 1 -C 18)alkoxy-(C 1 -C 18)haloalkyl, (C 1 -C 18)alkylthio-(C 1 -C 18)alkyl, (C 1 -C 18)haloalkylthio- (C 1 -C 18)alkyl, (C 2 -C 18)haloalkenyl, (C 2 -C 18)haloalkynyl, heterocyclyl-(C 1 -C 18)alkyl, aryl-(C 1 -C 18)alkyl, (C 3 -C 12)cycloalkyl-(C 1 -C 18)alkyl, (C 1 -C 18)alkoxycarbonyl-(C 1 -C 18)alkyl, and (C 1 -C 18)alkoxycarbonyl-(C 3 -C 12)cycloalkyl-(C 1 -C 18)alkyl, or a radical of the formula -NR a R b or - N=CR c R d, where, in the former 2 radicals, each of the R a, R b, R c and R d radicals is independently hydrogen, (C 1 -C 4)alkyl, (C 2 -C 4)alkenyl, (C 2 -C 4)alkynyl, benzyl, substituted benzyl, phenyl or substituted phenyl, or R a and R b together with the nitrogen atom may form a 3- to 8-membered heterocycle which may contain one or two further ring heteroatoms from the group of N, O and S, but not in the case of a 3- or 4-membered heterocycle, and which is unsubstituted or substituted by one or more radicals from the group of (C 1 -C 4)alkyl and (C 1 -C 4)haloalkyl, or R c and R d together with the carbon atom are a 3- to 8-membered carbocyclic or heterocyclic radical which may contain 1 to 3 ring heteroatoms from the group of N, O and S, where the carbocyclic or heterocyclic radical is unsubstituted or substituted by one or more radicals from the group of (C 1 -C 4)-alkyl and (C 1 -C 4)-haloalkyl, n is a number from 0 to 5, and p is 0, 1 or 2.