sodium iodide in acetone 1.) r.t., 12 h, 2.) reflux, 2 h;

1: 1.) butyl-lithium, 2.) tri-isopropylsilyl chloride / 1.) hexane, THF, r.t., 1 h, 2.) hexane, 0 deg C, 30 min, r.t., 17 h 2: 98 percent / triethylamine / CH2Cl2 / 0.5 h / -10 °C 3: 90.5 percent / NaI / acetone / 1.) r.t., 12 h, 2.) reflux, 2 h View Scheme

1: 98 percent / triethylamine / CH2Cl2 / 0.5 h / -10 °C 2: 90.5 percent / NaI / acetone / 1.) r.t., 12 h, 2.) reflux, 2 h View Scheme