[(1-phenyl-5-(heteroaryl)-1H-1,2,4-triazol-3-yl)oxy] acetic acid derivatives as safeners for the protection of useful plants and crop plants

A compound of general formula (I) or salt thereof

• in which
• R1 is heteroaryl, where the heteroaryl radical is unsubstituted or substituted by halogen, cyano, nitro, (C1-C6)alkyl, (C2-C6)alkenyl, (C2-C6)alkynyl, (C3-C8)cycloalkyl, (C3-C8)cycloalkenyl, (C1-C6)alkoxy or (C1-C6)alkylS(O)p, where the latter seven radicals are unsubstituted or are substituted by one or more radicals from the group of halogen, cyano, (C1-C6)alkoxy and (C1-C6)alkylS(O)p,
• R2 is hydrogen, halogen, cyano, nitro, (C1-C6)alkyl, (C2-C6)alkenyl, (C2-C6)alkynyl, (C3-C8)cycloalkyl, (C3-C8)cycloalkenyl, (C1-C6)alkoxy or (C1-C6)alkylS(O)p, where the latter seven radicals are unsubstituted or are substituted by one or more radicals from the group of halogen, cyano, (C1-C6)alkoxy and (C1-C6)alkylS(O)p,
• R3 is hydrogen or (C1-C6)alkyl,
• R4 is hydrogen, (C1-C18)alkyl, (C1-C18)haloalkyl, (C1-C18)cyanoalkyl, (C2-C18)alkenyl, (C2-C18)alkynyl, (C3-C12)cycloalkyl, (C3-C12)cycloalkenyl, aryl, heteroaryl, (C1-C18)alkoxy-(C1-C18)alkyl, (C1-C18)haloalkoxy-(C1-C18)alkyl, (C1-C18)alkoxy-(C1-C18)haloalkyl, (C1-C18)alkylthio-(C1-C18)alkyl, (C1-C18)haloalkylthio-(C1-C18)alkyl, (C2-C18)haloalkenyl, (C2-C18)haloalkynyl, heterocyclyl-(C1-C18)alkyl, aryl-(C1-C18)alkyl, (C3-C12)cycloalkyl-(C1-C18)alkyl, (C1-C18)alkoxycarbonyl-(C1-C18)alkyl, or (C1-C18)alkoxycarbonyl-(C3-C12)cycloalkyl-(C1-C18)alkyl, or
• a radical of the formula —NRaRb or —N═CRcRd,
• where, in the former 2 radicals, each of the Ra, Rb, Rc and Rd radicals is independently hydrogen, (C1-C4)alkyl, (C2-C4)alkenyl, (C2-C4)alkynyl, benzyl, substituted benzyl, phenyl or substituted phenyl,
• or Ra and Rb together with the nitrogen atom may form a 3- to 8-membered heterocycle which, in addition to the nitrogen atom, may contain one or two further ring heteroatoms from the group of N, O and S and which is unsubstituted or substituted by one or more radicals from the group of (C1-C4)-alkyl and (C1-C4)-haloalkyl,
• or Rc and Rd 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 (C1-C4)-alkyl and (C1-C4)-haloalkyl,
• m is a number from 0 to 5,
• and
• p is 0, 1 or 2.