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Scope of the electrophile and [B]–[B] reaction with phenylacetylene. [a] Reaction conditions: 1a (0.5 mmol), 2 (2 equiv), 3 (1.5 equiv), NaO t Bu (1.5 equiv), CuCl@POL‐NHC‐Ph (20 mg, 4.67 wt.% Cu), DMF (0.25 M), 60 °C, 7 h. Isolated yield. The value of β‐[B]:α‐[B] was determined by 1H NMR. [b] Room temperature. [c] The reaction time was 12 h.
