Table 1 Optimization of the reaction conditions^a.

^aUnless otherwise noted, reactions were carried out with 1a (0.6 mmol), 2a (0.2 mmol), Ni salt (0.01 mmol), ligand (0.012 mmol), Mn powder (0.3 mmol) in DMA (2.0 mL) under a nitrogen atmosphere at room temperature for 12 h.
^bAssay yields determined by ¹⁹F NMR with 1-iodo-4-(trifluoromethyl)benzene as internal standard.
^cRr refers to the ratio of desired product to the sum of all the other regioisomers, as determined by the ¹⁹F NMR analysis of the crude products.
^dIsolated yields.

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