B(R)₃, or boron trihalide, is a chemical compound consisting of a boron atom bonded to three identical halogen atoms, represented by the symbol R. The halogen can be any of the elements from the group of fluorine, chlorine, bromine, or iodine. This compound is known for its role in various chemical reactions and is often used in organic synthesis. Boron trihalides are typically colorless gases or liquids with strong odors. They are highly reactive and can form complexes with other molecules, making them useful in catalysis and as reagents in organic chemistry. Their unique properties are valuable in fields such as materials science and pharmaceuticals.