1: 74.6 percent / OsO4; NaIO4 / 24 h / 24 - 26 °C 2: 95.6 percent / AgNO3; NaOH / 12 h / 20 °C 3: 100 percent / (COCl)2 / 24 h / 20 °C 4: 92 percent / diethyl ether / 3 h / 0 - 15 °C View Scheme