4-Tritylaniline is primarily used in organic synthesis as a building block for more complex chemical structures. Its trityl group provides steric protection, making it useful in the preparation of intermediates for pharmaceuticals and agrochemicals. It is also employed in the development of dyes and pigments due to its aromatic amine properties. Additionally, it serves as a precursor in the synthesis of ligands for catalytic systems, particularly in asymmetric catalysis. Its stability and unique structure make it valuable in research for creating novel compounds with specific functionalities.