3-Iodophenylboronic acid is an organoboron compound featuring both a boronic acid group and an iodine substituent on the phenyl ring. This bifunctional structure makes it a versatile building block in synthetic organic chemistry, particularly in cross-coupling reactions. Its primary application is as a key reagent in Suzuki-Miyaura cross-coupling reactions. The boronic acid group readily participates in palladium-catalyzed coupling with aryl or vinyl halides, while the iodine atom serves as an excellent leaving group for further functionalization via other metal-catalyzed reactions (e.g., Sonogashira, Heck, or Buchwald-Hartwig couplings). This dual reactivity allows for the sequential, modular construction of complex biaryl and conjugated systems, which are common scaffolds in pharmaceuticals, agrochemicals, and organic materials. The compound is a solid and should be stored under inert conditions to prevent protodeboronation. It is widely available from chemical suppliers as a standard synthetic intermediate for research and development purposes.