Table 3.
Values indicate the yield of the isolated product. pin = 2,3-dimethylbutane-2,3-diol.
Conditions unless otherwise noted: aryl halide (1 equiv, 0.5 mmol), potassium alkyltrifluoroborate (1.5 equiv, 0.75 mmol), Giese acceptor (1.2 equiv, 0.60 mmol), [Ir(dFCF3ppy)2bpy]PF6 (2 mol %, 0.010 mmol), Ni(bpy)Br2 (5 mol %, 0.025 mmol), K2HPO4 (2 equiv, 1.0 mmol), THF (0.1 M), 16 h, irradiating with blue LEDs (6 W).
Reaction time extended to 48 h. dNi(phen)Br2 (5 mol %, 0.025 mmol) and 3 (3.0 equiv, 1.5 mmol) were used.