1.1: 80 percent / K2CO3 / dimethylformamide / 20 °C 2.1: 73 percent / 160 °C 3.1: 87 percent / K2CO3 / dimethylformamide / 20 °C 4.1: 95 percent / OsO4; NaIO4 / H2O; diethyl ether / 20 °C 5.1: 72 percent / nBuLi / tetrahydrofuran / 0 °C 6.1: 49 percent / sBuLi / tetrahydrofuran / -78 °C 7.1: 76 percent / IBX / toluene; dimethylsulfoxide / 20 °C 8.1: 63 percent / HCO2NH4 / Pd/C / acetone / 20 °C 9.1: PPh3; CCl4 / tetrahydrofuran / 20 °C 9.2: 43 percent / silica gel View Scheme