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Unless otherwise specified, the reactions were carried out in a Schlenk tube under nitrogen in the presence of 1a (0.2 mmol), 2a (0.4 mmol), NiBr2(dme) (10 mol%), L4 (10 mol%), NaI (1.5 equiv.), and Zn (3.0 equiv.) in DMA (0.5 mL) at 50 °C for 24 h.
