Abstract
A fully reversible photothermal isomerization between carborane-fused trigonal-planar azaborole (dark-purple) and tetrahedral borirane (pale-yellow) has been observed, leading to the isolation and structural characterization of the first example of carborane-fused borirane. DFT calculations indicate that the azaborole is thermodynamically more stable than the borirane by 11.2 kcal mol-1 , and the energy barrier for the thermal conversion from azaborole to borirane is 35.5 kcal mol-1 . The reactivity studies show that the B-C(cage) bond in borirane can be broken in the reaction with CuCl, HCl, or elemental sulfur.
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