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Ynone 1 (0.2 mmol, 1 equiv), Ni(acac)2 (0.02 mmol, 10 mol %), and SeO2 (0.3 mmol, 1.5 equiv) in DMF (2 mL) under irradiation using 15 W blue LED at room temperature for 5 h.
Isolated yield.
Ni(acac)2 (20 mol %), SeO2 (6.0 equiv), 24 h.
Reacted at 40 °C for 12 h.
Twenty-four hours.
