NEUE PYRROLIDINCARBONSAEUREDERIVATE, VERFAHREN ZU IHRER HERSTELLUNG

1. A pyrrolidinecarboxylic acid derivative of the formula I see diagramm : EP0168607,P11,F1 where R**1 , R**2 and R**3 independently of one another are each hydrogen, lower alkyl of not more than 5 carbon atoms, lower haloalkyl of not more than 3 carbon atoms and not more than 5 halogen atoms, phenylalkyl where alkyl is of not more than 4 carbon atoms, halophenylalkyl where the phenyl moiety has not more than 3 halogen atoms and alkyl is of not more than 4 carbon atoms, R**2 and R**3 moreover independently of one another are each substituted phenyl, substituents being up to 3 halogen atoms, a nitro group, a cyano group or an alkoxy group of not more than 4 carbon atoms, and furthermore R**3 may also be unsubstituted phenyl, R**4 is hydrogen, n- or isoalkyl of not more than 5 carbon atoms, phenylalkyl where alkyl is of not more than 4 carbon atoms, halophenylalkyl where the phenyl moiety has not more than 3 halogen atoms and alkyl is of not more than 3 carbon atoms, phenyl or substituted phenyl, substituents being up to 3 halogen atoms, a nitro group, a cyano group or an alkoxy group of not more than 4 carbon atoms, a five-membered or six-membered aromatic heterocycle having not more than 3 nitrogens as heteroatoms, cyano, alkylcarbonyl of not more than 5 carbon atoms, haloalkylcarbonyl of not more than 3 carbon atoms and not more than 5 halogen atoms or alkoxycarbonyl of not more than 5 carbon atoms, R**5 is alkylcarbonyl of not more than 5 carbon atoms, haloalkylcarbonyl of not more than 3 carbon atoms and not more than 5 halogen atoms, alkoxycarbonyl of not more than 5 carbon atoms, unsubstituted or substituted phenylcarbonyl, substituents being up to 3 halogen atoms, alkoxy of not more than 4 carbon atoms, alkylthio of not more than 4 carbon atoms, cyano or nitro, or R**5 is cyano or nitro, and R**6 is unsubstituted or substituted phenyl, substituents being up to 3 halogen atoms, alkoxy of not more than 4 carbon atoms, alkylthio of not more than 4 carbon atoms, alkyl of not more than 5 carbon atoms, cyano or nitro, or R**6 is tert-alkyl of not more than 5 carbon atoms.