Table 1. Optimization of the reaction conditions ^a .

Entry	Variation from the “standard” conditions	Yield b (%)
1	None	94 (87)
2	AuCl instead of IPrAuCl	0
3	PPh3AuCl instead of IPrAuCl	56
4	IMesAuCl instead of IPrAuCl	72
5	PPh3AuNTf2 instead of IPrAuCl and AgSbF6	67
6 c	IPrAuSbF6 instead of IPrAuCl and AgSbF6	88
7	CH3CN instead of DCE	5
8	CH3OH instead of DCE	4
9	Ru(phen)3Cl2 instead of Ru(bpy)3Cl2	67
10	Ir[dF(CF3)ppy]2(dtbbpy)PF6	0
11	fac-Ir(ppy)3 instead of Ru(bpy)3Cl2	0
12	IPrAuCl (5 mol%), AgSbF6 (7.5 mol%), Ru(bpy)3Cl2 (1.2 mol%)	64

^aReaction conditions: a mixture of 1a (0.4 mmol), 2a (0.2 mmol), IPrAuCl (10 mol%), AgSbF₆ (15 mol%), Ru(bpy)₃Cl₂ (2.5 mol%), in DCE (1 mL) was stirred at rt under irradiation with a 100 W blue LED at N₂ atmosphere.

^bDetermined by ¹⁹F NMR using (trifluoromethyl)benzene as the internal standard. The number in parentheses is the isolated yield. IPr = 1,3-bis(2,6-diisopropyl-phenyl)imidazol-2-ylidene, ppy = 2-phenylpyridine.

^cRu(bpy)₃(PF₆)₂ instead of Ru(bpy)₃Cl₂.