Cyclic Diaryl λ3‐Bromanes as Original Aryne Precursors

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Despite the widespread application of hypervalent iodines, the corresponding l 3 -bromanes are less explored. Herein we report a general, safe, and high-yielding strategy to access cyclic diaryl l 3 - bromanes. These unique compounds feature appealing and complementary reactivity to l 3 -iodanes, generating arynes under mild reaction conditions and in a presence of a weak base. Accordingly, formal meta -selective transition metal-free C-O and C-N couplings may be achieved. The mechanistic studies unambiguously support the aryne generation mechanism.