1: 71 percent / HgO, I2 / benzene / 2 h / Ambient temperature; Irradiation 2: NaCNBH3 / hexamethylphosphoric acid triamide / Ambient temperature View Scheme

1: 71 percent / HgO, I2 / benzene / 2 h / Ambient temperature; Irradiation 2: 61 percent / tetrahydrofuran / 2 h / Ambient temperature View Scheme

iodine; mercury(II) oxide in benzene 2 h; Ambient temperatureIrradiation;