1: water; sodium hydroxide / ethanol / 10 h / 70 °C 2: oxalyl dichloride; N,N-dimethyl-formamide / dichloromethane 3: iron (III) acetylacetonate / tetrahydrofuran / 0 - 20 °C View Scheme

1: water; sodium hydroxide / ethanol / 10 h / 70 °C 2: oxalyl dichloride; N,N-dimethyl-formamide / dichloromethane 3: iron (III) acetylacetonate / tetrahydrofuran / 0 - 20 °C 4: boron trichloride / dichloromethane / 3 h / -78 - -15 °C 5: triethylamine / dichloromethane 6: potassium tert-butylate / tetrahydrofuran / Reflux 7: toluene-4-sulfonic acid / water; benzene / Reflux 8: Pearlman's catalist; hydrogen / ethanol; ethyl acetate / 760.05 Torr View Scheme