1: 86 percent / LiAlH4 / diethyl ether / 5 h / Heating 2: 81 percent / CrO3-pyridine / acetic acid; diethyl ether / 0.25 h / 5 °C 3: 84 percent / methanol / 14 h / Ambient temperature 4: 50percent aq. NaOH / dioxane / 0.5 h / 80 °C 5: benzene / 20 °C / Irradiation; also gas phase pyrolysis View Scheme

1: 86 percent / LiAlH4 / diethyl ether / 5 h / Heating 2: 81 percent / CrO3-pyridine / acetic acid; diethyl ether / 0.25 h / 5 °C 3: 84 percent / methanol / 14 h / Ambient temperature 4: 50percent aq. NaOH / dioxane / 0.5 h / 80 °C 5: benzene / 20 °C / Irradiation; also gas phase pyrolysis View Scheme