Defluoroalkylative coupling of PhCF₃ with MgBn₂(THF)₂ catalyzed by 20 mol% loading Ln or Mg photocatalyst^a.

Entry	Catalyst	Time (h)	Yieldb (%)
1	1-Ce	48	51
2	1-Ce	80	91
3	2-Ce	48	6
4	4-Ce	48	41
5	4-Ce	80	65
6	1-La	48	67
7	1-La	60	72
8	2-La	48	19
9	1-Nd	48	32
10	1-Nd	140	87
11	1-Sm	48	12
12	7-Mg	48	24
13	7-Mg	80	56
14	None	260	22

^a20 mol% catalyst loading, 1 equiv. MgBn₂(THF)₂ and 1 equiv. PhCF₃, RT, THF-H₈, irradiation with a 40 W Kessil A160WE Tuna Blue lamp.

^bCombined yield of PhCF₂CH₂Ph and PhCF₂H.