1: 68 percent / copper(I) iodide, KF, iododiazine / dimethylformamide / 10 h / 115 °C 2: 2.) iodine / 1.) THF, hexane, -100 deg C, 20 min, 2.) THF, hexane, -100 deg C, 2 h View Scheme

iodine 1.) THF, hexane, -100 deg C, 20 min, 2.) THF, hexane, -100 deg C, 2 h; Yield given. Multistep reaction;