1: 62 percent / tert-butyl hydroperoxide, SeO2 / CH2Cl2 / 2.5 h / Ambient temperature 2: 100 percent / pyridine / 2 h / Ambient temperature 3: 100 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 3 h / 0 - 20 °C 4: diisopropylethylamine / CH2Cl2 / 1 h / Ambient temperature 5: sodium iodide / acetone / 4 h / Heating 6: 72 percent / silver nitrite / diethyl ether / 72 h / 0 - 20 °C 7: 91 percent / p-chlorophenyl isocyanate, Et3N / benzene / 14 h / Ambient temperature 8: 92 percent / aq. lithium hydroxide / tetrahydrofuran / 2 h / Ambient temperature 9: 84 percent / trimethyl borate, H2, H2O / methanol / 9 h / 1471.02 Torr / Ambient temperature View Scheme