Patent ID: RE41549

Claim:
N-benzyl-p-phenylenediamine derivatives of the general Formula (I) or their physiologically compatible, water-soluble salts in which R1 R1 is hydrogen, a (C 1 -C 4 ) alkyl group or a hydroxy-(C 1 -C 4 ) alkyl group, R2 is hydrogen, a halogen atom (F, Cl, Br, I), a cyano group, a (C 1 -C 4 ) alkoxy group, a hydroxy (C 1 -C 4 ) alkoxy group, a (C 1 -C 6 ) alkyl group, a (C 1 -C 4 ) alkyl thioether group, a mercapto group, a nitro group, an amino group, a (C 1 -C 4 ) alkylamino group, a di-(C 1 -C 4 ) alkylamino group, a di-(hydroxy-(C 1 -C 4 )-alkyl) amino group, a (hydroxy-(C 1 -C 4 )-alkyl) amino group, a trifluoromethane group, a —C(O)CH 3 group, a —C(O)CF 3 group, an —Si(CH 3 ) 3 group, a hydroxy-(C 1 -C 4 ) alkyl group, a dihydroxy-(C 3 -C 4 ) alkyl group or a morpholino group, R3, R4 independently of one another are hydrogen, a halogen atom, a hydroxy group, a (C 1 -C 4 ) alkoxy group, a hydroxy-(C 1 -C 4 ) alkoxy group, a (C 1 -C 6 ) alkyl group, a (C 1 -C 4 ) alkyl thioether group, a mercapto group, an amino group, a (C 1 -C 6 ) alkylamino group, a di-(C 1 -C 6 ) alkylamino group, a di-(hydroxy-(C 1 -C 4 )-alkyl)amino group, a hydroxy-(C 1 -C 4 ) alkylamino group, a trifluoromethane group, an acetamido group, a —C(O)CH 3 group, a —C(O)CF 3 group, an —Si(CH 3 ) 3 group, a hydroxy-(C 1 -C 4 ) alkyl group or a dihydroxy-(C 3 -C 4 ) alkyl group or R3 and R4 together form an —O—CH2—O— bridge and R5 is hydrogen, a hydroxy group or a (C 1 -C 6 ) alkyl group, with the proviso that (i) at least one of the R2 to R5 groups is different from a hydrogen; and (ii) R1 is not hydrogen or a (C 1 -C 4 ) alkyl group when R2=R4=R5=hydrogen and R3=chlorine; and ((iii) (iii) R4 is not a nitro group, a methyl group, a hydroxy group, an amino group, a dimethylamino group, a bromine atom or a chlorine atom when R1=R2=R3=R5=hydrogen ; and ( iv ) when R 1 and R 2 are both hydrogen and R 3 and R 5 are both alkyl, R 4 is not OH .