Stable hypervalent bromine(III) compounds were synthesized via aryl bromine oxidation with -hybridized nitrogen cations generated by oxime N-O bond cleavage in trifluoroacetic acid. The resulting intramolecular N-Br hypervalent bond is effectively stabilized by the planar xanthone structure. The structures and physicochemical properties of these λ-bromanes were characterized by X-ray crystallography, cyclic voltammetry, UV-vis spectroscopy, and computational analysis.
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