1: sodium iodide / acetone / 4 h / Heating 2: 72 percent / silver nitrite / diethyl ether / 72 h / 0 - 20 °C 3: 91 percent / p-chlorophenyl isocyanate, Et3N / benzene / 14 h / Ambient temperature 4: 92 percent / aq. lithium hydroxide / tetrahydrofuran / 2 h / Ambient temperature 5: 84 percent / trimethyl borate, H2, H2O / methanol / 9 h / 1471.02 Torr / Ambient temperature View Scheme