Used as an intermediate in the synthesis of pharmaceuticals and agrochemicals, 3-iodobenzaldehyde plays a key role in forming carbon-carbon bonds through cross-coupling reactions such as Suzuki and Heck reactions. Its iodine functionality allows for selective functionalization, making it valuable in the development of complex organic molecules. It is also employed in the preparation of bioactive compounds, including drugs targeting central nervous system disorders and anti-inflammatory agents. Additionally, it serves as a building block in materials science for creating specialty organic semiconductors and fluorescent dyes.