B-Bromocatecholborane is a versatile organoboron reagent used in organic synthesis, particularly for the bromoboration of alkynes and alkenes. It facilitates the stereoselective addition of bromine and the boryl group across carbon-carbon multiple bonds, yielding β-bromovinylboronates or alkylboronates that serve as valuable intermediates for further cross-coupling reactions, such as Suzuki-Miyaura couplings. This reagent is also employed in hydroboration-oxidation sequences to produce alcohols with high regioselectivity. Its stability and reactivity make it essential in the preparation of pharmaceutical intermediates, agrochemicals, and fine chemicals, enabling the construction of complex molecules in research and industrial settings.