Abstract

AbstractDespite the widespread application of hypervalent iodines, the corresponding λ3‐bromanes are less explored. Herein we report a general, safe, and high‐yielding strategy to access cyclic diaryl λ3‐bromanes. These unique compounds feature reactivity that is appealing and complementary to that of λ3‐iodanes, generating arynes under mild reaction conditions and in the presence of a weak base. Accordingly, formal meta‐selective transition‐metal‐free C–O and C–N couplings may be achieved. Mechanistic studies unambiguously support the aryne generation mechanism.

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