Table 5.

Reaction time, light source and concentration screening.^a

Entry	Time (h)	Light source	c (M)	Yield 4a (%)b
1	16	blue LEDs 467 nm (40 W)	0.05	42
2	1.5	blue LEDs 467 nm (40 W)	0.05	42
3	1	blue LEDs 467 nm (40 W)	0.05	39
4	0.17	blue LEDs 467 nm (40 W)	0.05	21
5	1.5	Kessil 467 nm (44 W)	0.05	42
6	1.5	Kessil 467 nm (22 W)	0.05	42
7	1.5	Kessil 440 nm (45 W)	0.05	41
8	1.5	green LEDs 525 nm (40 W)	0.05	35
9	4	CFL (8 W)	0.05	38
10	1.5	blue LEDs 467 nm (40 W)	0.025	36
11	1.5	blue LEDs 467 nm (40 W)	0.1-0.2	41

^aBlue/green LEDs refers to LED strips attached to a crystallization flask. The data were already published in the supporting information of ref. [45]. ^bNMR yield determined using CH₂Br₂ as internal standard.