2-Chloro-4-fluorophenylboronic acid is an organoboron compound featuring both chloro and fluoro substituents on the aromatic ring. It is a white to off-white crystalline powder with a molecular formula of C6H5BClFO2 and a molecular weight of 174.37 g/mol. This compound is a key member of the arylboronic acid family, widely used as a versatile building block in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions. Its primary application is as a crucial synthetic intermediate in the pharmaceutical industry. The presence of halogen atoms (Cl and F) makes it a valuable precursor for constructing complex molecules. It is extensively employed in the research and development of various active pharmaceutical ingredients (APIs), including kinase inhibitors and other biologically active heterocyclic compounds. The fluorine atom is often introduced to modulate metabolic stability and bioavailability. As a boronic acid derivative, it requires careful handling and storage under inert conditions (e.g., nitrogen atmosphere) to prevent protodeboronation and maintain stability. It is commercially available from major chemical suppliers for research and development purposes.