1,3,4-Tri:amino-isoquinoline hair dye coupler and developer - prepd. by hydrogenating 1,3-di:amino-4-nitroso-isoquinoline using a palladium catalyst

摘要

(I), which is new, is prepd. by hydrogenating 1,3-diamino-4-nitroso-isoquinoline in the presence of Pd as catalyst, at room temp. (I), or its inorganic or organic salts, is used as developer and/or coupler in oxidn. dye-based hair dyeing compsns. (I) yields strong, fast natural yellow to brown shades. (I) is a water-soluble, resists storage, is non-toxic and does not irritate the skin. Good dyeing results can be achieved on coupling (I) by air-O2. Oxidants, e.g. H2O2, may be added for a hair-bleaching effect in addn. to dyeing.