Table 1.

Optimization of the catalytic system.

Entry	Conditions[a]	t [h]	Conv. of 1a [%][b]	Yield of 3a [%][b]
1	4a (2 mol%), Air, CH3NO2	12	100	21
2	4a (2 mol%), CH3NO2	3	100	96
3	without 4a, CH3NO2	12	25	16
4	4a (2 mol%), CH3NO2, lightbulb off	12	35	9
5	4b (2 mol%), CH3NO2	12	100	79
6	4c (2 mol%), CH3NO2	12	100	73

^[a]Reaction conditions: 1a (0.2 mmol, 0.1m in degassed CH₃NO₂), 2a (1 mmol), irradiation with a 13 W fluorescent lightbulb at RT.

^[b]Measured by GC using dodecane as an internal standard. bpz=2, 2′-bipyrazine.