1.1: 70 percent / triisobutylaluminum / hexane; 1,2-dichloro-ethane / 3.8 h / 0 - 20 °C 2.1: aq. trifluoroacetic acid / 17 h / 20 - 50 °C 2.2: 76 percent / sodium methoxide / methanol / 3 h / 0 °C 3.1: ozone / methanol / 0.08 h / -78 °C 3.2: dimethyl sulfide / methanol / 5 h / -78 - 20 °C 4.1: 27 mg / HOSO2NH2; NaH2PO4*2H2O; NaClO2 / 2-methyl-propan-2-ol; H2O / 0.25 h View Scheme