Used in the synthesis of hair dyes and pigments due to its ability to form stable color compounds when oxidized. It acts as a coupler in oxidative dye formulations, helping to produce a range of shades, especially natural-looking browns and blacks. Also employed in the preparation of pharmaceutical intermediates and in research for developing nitrogen-rich heterocyclic compounds. Its reactivity with carbonyl and aldehyde compounds makes it useful in the production of specialty polymers and functional materials.