1: 95 percent 2: 90 percent / copper(I) iodide / tetrahydrofuran; various solvent(s) / 2.5 h / -20 deg C, allowed to warm to room temperature 3: LiAlH4 4: 87 percent / hydrogen bromide 5: 76 percent / magnesium / tetrahydrofuran / Heating 6: 95 percent / copper(I) iodide / tetrahydrofuran; various solvent(s) / 24 h / -20 - 0 °C View Scheme