1: thionyl chloride / 2 h / Heating 2: tetrahydrofuran / 0.5 h 3: 27 percent / ethanol / 1 h / Irradiation 4: 9 percent / KOH (40percent) / ethanol; dioxane / 2.5 h / Heating 5: 65 percent / potassium dichromate / dioxane; acetic acid / 5 h / Ambient temperature 6: 28 percent / MnO2, H2SO4 (conc.) / 0.5 h / 60 °C 7: silver oxide / dioxane / 1.5 h / Ambient temperature View Scheme

thionyl chloride 2 h; Heating;