Bis(pinacolato)diboron（Cat No.:R057400）(B<sub>2</sub>pin<sub>2</sub>) is an organoboron compound with the molecular formula C<sub>12</sub>H<sub>24</sub>B<sub>2</sub>O<sub>4</sub>, widely used as a boron source in organic synthesis, particularly in Suzuki-Miyaura and other cross-coupling reactions. It features two boron atoms each coordinated with a pinacolato ligand, making it a stable, crystalline, air- and moisture-tolerant reagent. B<sub>2</sub>pin<sub>2</sub> facilitates the borylation of aryl and alkyl halides, enabling the formation of boronic esters that are key intermediates in pharmaceuticals and fine chemicals. Its high reactivity, functional group tolerance, and ease of handling make it essential in modern synthetic chemistry.