2-Bromo-4-chlorobenzaldehyde is an organic compound featuring both aldehyde and halogen (bromine and chlorine) substituents on a benzene ring. It is a white to off-white crystalline powder with a molecular formula of C7H4BrClO and a molecular weight of 219.46 g/mol. This compound is a versatile and important building block in organic synthesis. Its primary application lies in serving as a key intermediate in the synthesis of more complex molecules. The reactive aldehyde group allows for various condensation and nucleophilic addition reactions, while the halogen atoms (bromine and chlorine) provide sites for further functionalization via cross-coupling reactions (e.g., Suzuki, Heck, or Buchwald-Hartwig couplings). This makes it a valuable precursor in pharmaceutical research for constructing drug candidates, particularly those containing a substituted benzaldehyde core. It is also used in the synthesis of agrochemicals and functional materials. The compound should be handled with care as it may cause skin and eye irritation. It is typically stored in a cool, dry place, protected from light.