COUPLER WITH CATIONIC 7-AMINO-1,2,3,4-TETRAHYDROQUINOLINE STRUCTURE, DYEING COMPOSITION COMPRISING SAME, PROCESSES AND USES

摘要

The invention relates to the use of specific heterocyclic couplers which are cationic 7-amino-1, 2, 3, 4-tetrahydroquinoline derivatives of formula (I) for dyeing keratin fibres such as the hair: in which formula (I): R1 to R6, CAT+, An-, and Ra to Rb are as defined in the description.