1: 91 percent / TMSOTf / CH2Cl2 / 0.25 h / 0 °C 2: 90 percent / 4A molecular sieves, N-iodosuccinimide, TfOH / CH2Cl2 / 0.17 h / -35 °C 3: 66 percent / 50percent aq. AcOH / 12 h / 40 °C 4: 54 percent / H2 / Raney Ni (W4) / ethanol / 1.5 h / 40 °C 5: 99 percent / m-chloroperoxybenzoic acid / CH2Cl2 / 0.17 h / 25 °C 6: 58 percent / bis(tri-n-butyltin) oxide, Br2 / CH2Cl2 / 24 h / 25 °C 7: 84 percent / H2 / Rany Ni (W4) / ethanol / 1 h / 25 °C View Scheme