1: 72 percent / N-chlorosuccinimide, silver nitrate / acetonitrile; H2O / 1.) -5 deg C, 0.5 h, 2.) room temperature, 1 h 2: 95 percent / sodium borohydride / methanol / 0.75 h / -110 °C 3: acetonitrile; pentane / 15 h / Ambient temperature 4: 16.1 mg / anhydrous sodium iodide, chlorotrimethylsilane / acetonitrile / 3.25 h View Scheme