Upon complexation to CuOTf, a PMe-stabilized bis(9-anthryl) diborene slowly undergoes an intramolecular hydroarylation reaction at room temperature. Subsequent triflation of the B-H bond with CuOTf, followed by a PMe transfer, finally yields a cyclic sp-sp boryl-substituted boronium triflate salt.

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http://dx.doi.org/10.1039/c7cc07371bDOI Listing

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