BENZENE-1,3-DIAMINES; PROCESS FOR PREPARING THEM; INTERMEDIATES AND USE OF THESE BENZENE-1,3-DIAMINES AS COUPLING AGENTS FOR THE OXIDATION DYEING OF KERATINIC FIBERS, ESPECIALLY HUMAN HAIR

摘要

SHORT DESCRIPTION New meta having the formula: wherein R1 and R2 independently of one another hydrogen, alkyl C1-C4 or a mono- or polyhydroxyalkyl radical C2-C3, Z and Z 'repre-tent independently of the other an alkyl radical C1-C4 hydroxyalkyl or C2-C4 with the proviso that when R1 and R2 simultaneously denote a hydrogen atom, Z and Z 'do not simultaneously designated gnent-methyl, and salts thereof addition with an acid, are useful as couplers for the oxidation dyeing of keratin fibers, particularly human hair. The invention also relates to the intermediate compounds of formula: in which R 'denotes a hydrogen atom, an alkyl radical in C1-C4 alkyl, mono- or polyhydroxyalkyl radical C2 or C3 acétyleou .beta.-chloréthoxycarbonyle and Z and Z' represent, independently of one another alkyl C1-C4.