3,5-Dimethylbromobenzene is an organic compound with the molecular formula C8H9Br. It is a colorless to pale yellow liquid at room temperature. Structurally, it is a bromobenzene derivative with two methyl groups substituted at the meta positions relative to the bromine atom. This substitution pattern makes it a valuable and versatile building block in organic synthesis. Its primary application is as a key intermediate in the synthesis of more complex organic molecules. The bromine atom serves as an excellent site for various cross-coupling reactions, such as Suzuki, Negishi, and Kumada couplings, allowing for the introduction of the 3,5-dimethylphenyl moiety into target structures. This moiety is particularly significant in materials science, where it is used to construct ligands for metal-organic frameworks (MOFs), organic semiconductors, and as a precursor unit in the synthesis of advanced materials for organic light-emitting diodes (OLEDs) and other optoelectronic devices. While not a final active ingredient itself, 3,5-dimethylbromobenzene is a fundamental synthon in research and industrial chemistry. It is valued for its role in creating sterically hindered and electronically modified aromatic systems. Standard safety precautions for handling halogenated aromatic compounds should be observed, including the use of personal protective equipment due to its potential irritant properties.