Fig. 2: Scope of alkyne substrates.

^aReaction conditions: alkyne (0.3 mmol), cyclohexane (10 equiv.), FeCl₃ (0.001 equiv.), FeCl₂•4H₂O (0.5 equiv.), L6 (0.5 equiv.), and CH₃CN (3 mL) under N₂ and irradiation of a 30 W 365 nm LED for 48 h. ^bFeCl₃ (0.1 equiv.). ^cReacting for 24 h. ^dReacting for 7 d.