1: triethylamine; bis(triphenylphosphine)palladium(II) chloride / dimethylformamide / 12 h / 110 °C 2: 38.3 g / H2 / platinum oxide hydrate / aq. ethanol 3: 73 percent / aq. NaOH / ethanol / 6 h / 20 °C 4: oxalyl chloride / CH2Cl2 / 4 h / 20 °C 5: 4.1 g / aluminum chloride / CH2Cl2 / 2 h / Heating View Scheme