Table 1. Reaction condition screening ^a .

Entry	Metal (mol%)	Solvent	Temp. (°C)	Yield b (%)
1	Cu(OTf)2/10	THF	80	Trace
2	CuBr/10	THF	80	Trace
3	Pd(TFA)2/10	THF	80	Trace
4	NiCl2/10	THF	80	Trace
5	FeSO4·7H2O (10)	THF	80	Trace
6	Fe(OAc)2 (10)	THF	80	Trace
7	Fe(acac)3 (10)	THF	80	Trace
8	Fe(OTf)3 (10)	THF	80	85
9	Fe(OTf)3 (10)	THF	rt	46
10	Fe(OTf)3 (10)	THF	40	56
11	Fe(OTf)3 (10)	THF	60	69
12	Fe(OTf)3 (10)	PhCH3	80	6
13	Fe(OTf)3 (10)	CH3CN	80	—
14	Fe(OTf)3 (10)	DMF	80	21
15	Fe(OTf)3 (10)	DME	80	70
16	Fe(OTf)3 (10)	Dioxane	80	80
17	Fe(OTf)3 (5)	Dioxane	80	90 (85) c
18	Fe(OTf)3 (100)	Dioxane	80	36
19	Fe(OTf)2(5)	Dioxane	80	65 c
20	HOTf (15)	Dioxane	80	34
21	—	Dioxane	80	Trace
22 d	White LED light	Dioxane	rt	Trace

^aReactions were conducted with styrene (0.5 mmol), 2 (1.0 mmol), catalyst and solvent (2 mL) at 80 °C for 12 h.

^bYield of product detected using GC.

^cYield of isolated product.

^d5 mol% of RuCl₃(bpy)₃ 6H₂O as photocatalyst.