Experimental Details: In duplicate in a 4-ml vial equipped with a teflon septa and 2x7 mm stir bar, were weighed 4-bromoacetophenone (4.95 mg, 25 μmol) and potassium benzyltrifluoroborate (4.50 mg, 25 μmol, 1 equiv.). To this vial was added a 1.0 ml solution in DMA containing NiCl2-dme (1.1 mg, 5 μmol, 0.1 mol %), dtbbpy (1.3 mg, 5 μmol, 0.1 mol %) and Ir(dF-CF3-ppy)2 (dtbpy) (1.12 mg, 1 μmol, 0.02 mol %) followed by addition of 2,6-lutidine (17.5 μl, 150 μmol, 6 equiv.) . The solution was sparged with nitrogen via submerged needle for 5 minutes and vial was placed in EvoluChem photoreactor with blue Kessil 34W LED or with a EvoluChem Royal Blue LED 18W. Reaction time course was monitored at 0, 5, 15, 45, 120, 240, and 360 minutes.