Table 1.

Optimization: photocyclization of 2‐aryloxyketones.

Entry	Catalyst	Conversion [%]	Yield [%]
1	Ru(bpy)3Cl2	0	–
2	Ru(phen)3Cl2	0	–
3	[Ir(dtbbpy)(ppy)2]PF6	<5	trace
4	fac‐Ir(ppy)3	45	44
5	[Ir(dF(CF3)ppy)2(dtbbpy)]PF6	80	77
6	Ir(Fppy)3	100	95

[a] Reaction conditions: 1 a (0.05 mmol), KOAc (1.0 equiv), catalyst (1 mol %), 12 W blue LED, MeCN ([1 a]=0.05 mol dm⁻³), 60 °C, 16 h. Conversion and yields measured by ¹H NMR spectroscopy vs. internal standard.