1: 94 percent / L-(+)-diethyl tartarate, Ti(OPr-i)4, t-BuOOH, molecular sieves 4A / CH2Cl2 / 20 h / -20 °C 2: 77 percent / hexane; CH2Cl2 / 16 h / 0 - 20 °C 3: NaIO4 / tetrahydrofuran; H2O / 0.17 h / Ambient temperature 4: PPh3 / CH2Cl2 / 0.33 h / 0 °C 5: 87 percent / BuLi / tetrahydrofuran / 30 h / -78 °C View Scheme