Single crystal structure of2h. Thermal ellipsoids are drawn at the 50% probability level. Some ellipsoids and hydrogen atoms have been removed for clarity. Selected bond lengths [Å] and angles [°]: N1─B1 1.438(6), N1─B2 1.452(6), C4─C5 1.202(6), C7─C8 1.209(7), C4─B1─C7 117.5(4), C4─B1─N1 119.3(4), C7─B1─N1 123.2(4), C3─N1─B1─C7 18.2(5), and C1─N1─B2─C3 18.8(4).