N1-Benzylbenzene-1,4-diamine is primarily used in the synthesis of dyes and pigments, particularly in the production of hair dyes. Its chemical structure allows it to act as an intermediate in the creation of oxidative hair colorants, where it reacts with other compounds to form stable, long-lasting color molecules. Additionally, it finds application in the development of photographic chemicals, where it contributes to the formation of light-sensitive compounds used in imaging processes. In organic synthesis, it serves as a building block for more complex molecules, particularly in the pharmaceutical industry, where it can be used to develop drugs or bioactive compounds. Its role in polymer chemistry is also notable, as it can be incorporated into polymers to modify their properties, such as enhancing durability or altering color characteristics.