1: 75 percent / (-)-DIPT, TBHP, TIP / CH2Cl2 / 2 h / -20 °C 2: 85 percent / triphenyl phosphine, CCl4 / 80 °C 3: 88 percent / sodium sand / diethyl ether / Ambient temperature 4: 79 percent / imidazole / dimethylformamide 5: O3, triphenyl phospine / CH2Cl2 / -78 °C 6: 68 percent / NaClO2, NaH2PO4, H2O2 / H2O; acetonitrile / 0 - 10 °C 7: 60 percent / PTSA / CHCl3 View Scheme