Heterocyclically substituted heterocyclylcarboxylic acid derivatives

Heterocyclic carboxylic acid derivatives of the formula (I),

• in which the symbols have the following meaning:
• X represents hydrogen, halogen, cyano, hydroxyl, optionally substituted alkyl, haloalkyl, optionally substituted alkoxy, optionally substituted phenyl, optionally substituted alkylthio, optionally substituted alkylsulphinyl or optionally substituted alkylsulphonyl;
• Het represents one of the radicals
• U, V and W independently of one another represent hydrogen, fluorine, chlorine, bromine, cyano, hydroxyl, mercapto, nitro, methyl, ethyl, methoxy, methylthio, hydroximinomethyl, hydroximinoethyl, methoximinomethyl, methoximinoethyl, trifluoromethyl, trichloromethyl, pentafluoroethyl, heptafluoroisopropyl, heptafluoron-propyl, carboxyl and/or carboxymethyl;
• Z represents hydroxyl, halogen or in each case optionally substituted alkoxy, alkylthio, alkylsulphonyl or the group
• Y represents hydrogen, halogen, optionally substituted alkyl, haloalkyl, or optionally substituted cycloalkyl, O—(C1-C4)-alkyl or S(O)0-2(C1-C4)-alkyl;
• R1 represents hydrogen, optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, haloalkyl, optionally substituted cycloalkyl or optionally substituted heterocyclyl, hydroxyl, optionally substituted alkoxy, amine, optionally substituted alkylamine or optionally substituted dialkylamine;
• R2 represents hydrogen or alkyl;
• or
• R1 and R2 together with the nitrogen atom to which they are attached represent an optionally substituted heterocyclic ring;
• R3 represents
• COOH, CO—O−M1;
• R4 represents hydrogen, in each case optionally substituted alkyl, alkenyl or alkynyl, haloalkyl, in each case optionally substituted saturated or unsaturated cycloalkyl which may optionally be interrupted by heteroatoms, in each case optionally substituted phenyl, heteroaryl, arylalkyl, heteroarylalkyl;
• M1 represents a cation, such as, for example, mono- or divalent metal atoms, or an optionally alkyl- or arylalkyl-substituted ammonium ion;
• R5 represents the groups COR6, S(O)1-2R6, cyano, COOR6;
• or
• R4 and R5 together with the nitrogen atom to which they are attached represent an optionally substituted saturated, unsaturated or aromatic ring which may optionally be interrupted by further heteroatoms;
• R6 represents hydrogen, in each case optionally substituted alkyl, alkenyl, alkynyl, haloalkyl, represents in each case optionally substituted cycloalkylalkyl, cycloalkyl or cycloalkenyl, in each case optionally substituted aryl, heteroaryl, arylalkyl or heteroarylalkyl;
• or
• R4 and R6 together with the N—CO or N—S(O)1-2 group to which they are attached form a 4- to 8-membered cycle which may contain one or more heteroatoms from the group consisting of sulphur, oxygen and/or nitrogen, where oxygen atoms must not be adjacent;
• and agrochemically active salts thereof.