1: Zn dust, acetic acid / methanol / 0.25 h / Heating 2: diethyl ether / Ambient temperature 3: 95 percent / CrO3, pyridine / CH2Cl2 / 6 h / 0 °C 4: 84 percent / LiAlH(OtBu)3 / tetrahydrofuran / 3 h / 0 °C 5: 99 percent / CSA / benzene / 0.5 h / Heating 6: 49 percent / LDA, HMPA / hexane; tetrahydrofuran / -78 - -40 °C 7: 33 percent / 30percent H2O2, acetic acid / H2O; tetrahydrofuran View Scheme