Substituted 1H-3-aryl-pyrrolidine-2,4-dione derivatives

Substituted 3-aryl-pyrrolidine-2,4-dione derivatives of the general formula (I) ##STR99## in which X represents alkyl, halogen or alkoxy,

• Y represents hydrogen, alkyl, halogen, alkoxy or halogenoalkyl,
• Z represents alkyl, halogen or alkoxy,
• n represents a number from 0-3,
• A represents hydrogen, or represents alkyl, alkoxyalkyl or alkylthioalkyl, each of which is optionally substituted by halogen, cycloalkyl which is optionally interrupted by hetero atoms, or represents aryl, arylalkyl or hetaryl, each of which is optionally substituted by halogen, alkyl, halogenoalkyl, alkoxy or nitro,
• B represents hydrogen, alkyl or alkoxyalkyl,
• or in which
• A and B together with the carbon atom to which they are bonded form an optionally substituted saturated or unsaturated cycle which can be interrupted by oxygen and/or sulphur,
• L represents oxygen or sulphur, and
• R.sup.4 and R.sup.5 independently of each other represent hydrogen, or represent alkyl, alkenyl, alkoxy or alkoxyalkyl, each of which is optionally substituted by halogen, or represent optionally substituted phenyl or optionally substituted benzyl, or R.sup.4 and R.sup.5 together represent an alkylene radical which is optionally interrupted by oxygen,
• and the pure enantiomeric forms of compounds of the formula (I).