3-hydroxy-4-aryl-5-oxo-pyrazoline derivatives

A 3-hydroxy-4-aryl-5-oxopyrazoline derivative of the formula ##STR118## in which A and B together with the two nitrogen atoms of the pyrazoline ring represent a group of the formula ##STR119## which is optionally monosubstituted to trisubstituted by identical or different substituents, selected from the group consisting of halogen, optionally substituted C.sub.1 -C.sub.14 -alkyl, optionally substituted C.sub.2 -C.sub.14 -alkenyl, optionally substituted C.sub.1 -C.sub.4 -alkoxy-C.sub.2 -C.sub.6 -alkyl or optionally substituted C.sub.1 -C.sub.4 -polyalkoxy-C.sub.2 -C.sub.6 -alkyl, wherein the substituents on said moieties are fluorine or chlorine, optionally substituted phenyl and optionally substituted benzyl, wherein the substituents on the phenyl or benzyl moleties are fluorine, chlorine, nitro, methyl, ethyl, propyl, i-propyl, methoxy, ethoxy, or trifluoromethyl, and

• X represents methyl, ethyl, propyl, i-propy-1, fluorine, chlorine, bromine, methoxy and ethoxy
• Y represents hydrogen, methyl, ethyl, propyl, i-propyl, butyl, i-butyl, tert-butyl, fluorine, chlorine, bromine, methoxy, ethoxy and trifluoromethyl,
• Z represents methyl, ethyl, i-propyl, butyl, i-butyl, tert-butyl, fluorine, chlorine, bromine, methoxy and ethoxy,
• n represents a number 0, 1, 2 or 3,
• G represents hydrogen (a) or the group E (g)
• in which
• E represents a sodium or an ammonium ion.