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 benzyl trifluoroborate (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 photo reactor 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.
