4-Chlorophenylboronic acid serves as a versatile reactant in various chemical reactions, particularly in organometallic and cross-coupling processes. This white or off-white crystalline powder is moderately soluble in water and readily dissolvable in strong polar organic solvents, making it valuable in numerous synthetic applications. It plays a key role in palladium-catalyzed processes such as direct arylation, cyclopalladation, and tandem-type oxidative Heck reactions. Additionally, it is utilized in copper-mediated fluoroalkylation and ligand-free copper-catalyzed coupling reactions. Its utility extends to ruthenium-catalyzed direct arylation and regioselective Suzuki-Miyaura and Sonogashira cross-coupling reactions. Furthermore, 4-Chlorophenylboronic acid is instrumental in synthesizing compounds like substituted diarylmethylidenefluorenes, Baclofen lactam, and palladium(II) thiocarboxamide complexes, as well as biaryls through reactions with aryl chlorides, bromides, and iodides.