“…In recent years, interest in the condensed-phase reactivity of tetrahalodiboranes(4) has come almost exclusively from our laboratories, where B 2 Br 4 is used as a precursor for Lewis base adducts and the construction of boron-boron multiple bonds (B, Figure 1), 1a,b,f,10 as well as precursors to bis(boratabenzene) ligands in transition metal complexes (C, Figure 1). 11 Beyond these applications, however, tetrahalodiboranes(4) offer a near-unlimited number of intriguing possibilities in organic, main-group, transitionmetal, and materials chemistry that we have only begun to explore. The hesitance of the scientific community to adopt these versatile reagents clearly stems from their synthetic routes, which are tedious, temperamental, and require special apparatus in some cases.…”