1: 87 percent / imidazole, PPh3, I2 / CH2Cl2 / 1.5 h / Ambient temperature 2: 77 percent / Zn, NiCl2*6H2O, I2 / pyridine / 0.75 h / Ambient temperature 3: 82 percent / tetrahydrofuran / 1.) 0 deg C, 15 min, 2.) room temperature, 3 h View Scheme

1: 87 percent / imidazole, PPh3, I2 / CH2Cl2 / 1.5 h / Ambient temperature 2: 77 percent / Zn, NiCl2*6H2O, I2 / pyridine / 0.75 h / Ambient temperature 3: 82 percent / tetrahydrofuran / 1.) 0 deg C, 15 min, 2.) room temperature, 3 h 4: 93 percent / 9-acetylanthracene / methanol / 2 h / 5 °C / Irradiation 5: 71 percent / n-BuNF / tetrahydrofuran / 4 h / 45 °C View Scheme

1: 87 percent / imidazole, PPh3, I2 / CH2Cl2 / 1.5 h / Ambient temperature 2: 77 percent / Zn, NiCl2*6H2O, I2 / pyridine / 0.75 h / Ambient temperature 3: 82 percent / tetrahydrofuran / 1.) 0 deg C, 15 min, 2.) room temperature, 3 h 4: 81 percent / n-Bu4NF / tetrahydrofuran / 5.5 h / Heating View Scheme

tetrapropylammonium perruthennate; 4-methylmorpholine N-oxide in dichloromethane Molecular sieve;