Table 1. Optimization of Reaction Conditions.

entry	catalyst (mol %)	2 (equiv vs 1)	yield (%)a
1	none	1	20
2	none	10	35
3	CoCl2 (5)	10	42
4	III (5)	1	18
5	III (5)	3	43
6	III (5)	5	58
7	III (5)	10	73
8	III (5)	20	73
9b	none	10	0
10b	III (5)	10	<1
11	III (5)	10	74

^aYields were determined by integration of ¹⁹F NMR resonances using C₆F₆ as an internal standard based on 1 as the limiting reagent, as described in the Supporting Information.

^bReaction performed in the dark.