1: 98.5 percent / KOH, H2O / ethanol / 3 h / Heating 2: oxalyl chloride / CH2Cl2 / 1 h / Heating 3: NaHCO3 / diethyl ether / 2 h / Ambient temperature 4: phosphoryl chloride / benzene / 2 h / Heating 5: 100 percent / 1,2-dichloro-benzene / 1 h / 180 °C 6: 62 percent / NaBH4 / methanol / Ambient temperature View Scheme

1: 98.5 percent / KOH, H2O / ethanol / 3 h / Heating 2: oxalyl chloride / CH2Cl2 / 1 h / Heating View Scheme