Used primarily in the synthesis of azo dyes, which are important for coloring textiles, paper, and leather. It serves as a key intermediate in the production of polybenzimidazole polymers, known for their high thermal stability and used in fire-resistant fabrics and aerospace materials. Additionally, it is utilized in organic synthesis for creating complex molecules in pharmaceuticals and agrochemicals. Its role in the development of fluorescent dyes makes it valuable in biological imaging and diagnostic applications.