Fig. 3: Substrate scope: 7-Oxabenzonorbornadienes.

Reaction conditions: 1a (0.10 mmol), 2 (0.15 mmol), (Ra)-Co-7 (5 mol%), NaOPiv (30 mol%) in TFE/HFIP (0.4 mL, v/v = 3:1) at 50 °C for 18 h.

Reaction conditions: 1a (0.10 mmol), 2 (0.15 mmol), (Ra)-Co-7 (5 mol%), NaOPiv (30 mol%) in TFE/HFIP (0.4 mL, v/v = 3:1) at 50 °C for 18 h.