Table 1.

Optimization of Trifluoromethylation Reaction^[a][b]

entry	metal salt	metal salt/ KF equiv	yield (%)
1	AgOAc	2/2	6
2	Ag2O	2/2	6
3	AgNO3	2/2	40
4	AgF	2/2	45
5	AgOTf	2/2	68
6	AgOTf	4/4	87
7 [c]	AgOTf	4/0	0
8 [d]	AgOTf	4/4	53
9	[CuOTf]2·C6H6	2/2	0
10	CuI	4/4	0

^[a]General conditions: C₆H₆ (20 equiv), TMSCF₃ (1 equiv) in DCE at 85 °C for 24 h.

^[b]Yields determined by ¹⁹F NMR analysis.

^[c]No KF.

^[d]Conditions: C₆H₆ (1 equiv), TMSCF₃ (5 equiv), AgOTf (4 equiv), KF (4 equiv) in DCE at 85 °C for 24 h.