1: 49 percent / sodium hydride / tetrahydrofuran / 3 h / Ambient temperature 2: 1) triphenylphosphine, iodine, 2) triethylamine / 1) MeCN, room temperature, 3.5 h, 2) MeCN, reflux, 24 h View Scheme

iodine; triethylamine; triphenylphosphine 1) MeCN, room temperature, 3.5 h, 2) MeCN, reflux, 24 h; Yield given. Multistep reaction;