In organic synthesis, 4-bromobenzonitrile was used to synthesize 4-iodobenzonitrile by light-induced aromatic Finkelstein iodination. Can also be used as a test compound for aryl halides to develop greener reaction conditions for ChemicalbookSuzuki cross-coupling between aryl halides and phenylboronic acids. 4-Bromobenzonitrile is classified as an organic nitriles, which are commonly used solvents and can be further reacted for various applications such as the manufacture of polymers and pharmaceutical intermediates and other organic chemicals.