1: 91 percent / sulfuric acid / methanol / 3 h / Heating 2: 70 percent / n-butyllithium / tetrahydrofuran; hexane / 48 h / Ambient temperature 3: 1.) borane-methyl sulfide complex, 2.) hydrogen peroxide, sodium hydroxide / 1.) THF, room temperature, 3 h, 2.) water, 25 deg C; reflux, 1 h 5: sodium iodide / acetone / Heating 6: 60 percent / hydrochloric acid, glacial acetic acid / H2O / 0.5 h / 70 °C 7: sodium hydride / tetrahydrofuran / 4 h / 60 °C View Scheme

potassium carbonate in acetone 4 h; Heating;

potassium carbonate in N-methyl-acetamide