4-Iodobenzylamine is primarily used in organic synthesis as a building block for the preparation of more complex chemical compounds. It serves as a key intermediate in the production of pharmaceuticals, particularly in the development of drugs targeting neurological disorders and cancer. The iodine atom in its structure allows for further functionalization through various coupling reactions, such as Suzuki or Sonogashira couplings, enabling the creation of diverse molecular architectures. Additionally, it is employed in the synthesis of ligands for metal-catalyzed reactions, which are crucial in industrial and research applications. Its role in the development of radiopharmaceuticals is also noteworthy, as it can be used to create compounds for diagnostic imaging.