4-Propylaniline is primarily used as an intermediate in the synthesis of various organic compounds. It plays a significant role in the production of dyes and pigments, particularly azo dyes, which are widely used in the textile, paper, and leather industries. Additionally, it serves as a building block in the manufacture of pharmaceuticals, where it is utilized to create active pharmaceutical ingredients (APIs) for therapeutic applications. In agrochemicals, 4-propylaniline is employed in the development of pesticides and herbicides, contributing to crop protection and agricultural productivity. Its versatility also extends to the field of organic synthesis, where it is used to produce specialty chemicals and fine chemicals for research and industrial purposes.