1: 1.) N-chlorosuccinimide, dimethyl sulphide, 2.) Zn / 2.) acetic acid 2: 87 percent / dioxane 3: sodium metaperiodate 4: 5percent H2SO4-AcOH / tetrahydrofuran / 3 h / Heating 6: 1.) H2, 5percent HCl, 2.) O3 / 1.) r.t., 4 d 7: 1.) O3, 2.) Me2S 8: sulphamic acid, sodium chlorite 9: H2SO4 / acetone 10: 52 percent / AlCl3, Me2S / CH2Cl2 / -10 °C 11: 68 percent / 5percent HCl / acetone / 24 h / 55 °C View Scheme