1: 1.) aq. NaOH, 2.) H2, sodium hydrogen phosphate, H3PO4 / 2.) 10percent Pd/C / 1.) 95 deg C, 45 min, 2.) 120 deg C, 2.8 atm, 14 h 2: 86 percent / LiAlH4 / diethyl ether / 5 h / Heating 3: 81 percent / CrO3-pyridine / acetic acid; diethyl ether / 0.25 h / 5 °C 4: 84 percent / methanol / 14 h / Ambient temperature 5: 50percent aq. NaOH / dioxane / 0.5 h / 80 °C 6: benzene / 20 °C / Irradiation; also gas phase pyrolysis View Scheme

1: 1.) aq. NaOH, 2.) H2, sodium hydrogen phosphate, H3PO4 / 2.) 10percent Pd/C / 1.) 95 deg C, 45 min, 2.) 120 deg C, 2.8 atm, 14 h 2: 86 percent / LiAlH4 / diethyl ether / 5 h / Heating 3: 81 percent / CrO3-pyridine / acetic acid; diethyl ether / 0.25 h / 5 °C 4: 84 percent / methanol / 14 h / Ambient temperature 5: 50percent aq. NaOH / dioxane / 0.5 h / 80 °C 6: benzene / 20 °C / Irradiation; also gas phase pyrolysis View Scheme