1: 100 percent / H2 / Pd/C / ethyl acetate; methanol / 5 h / 2068.59 Torr 2: K2CO3 / acetone; acetonitrile / 15 h / Heating 3: 1.26 g / KOH / methanol; H2O / 10 h / 70 °C 4: oxalyl chloride / CH2Cl2 / 20 h / 20 °C 5: tetrahydrofuran; hexane; acetonitrile / 4 h View Scheme

1: K2CO3 / acetone; acetonitrile / 15 h / Heating 2: 1.26 g / KOH / methanol; H2O / 10 h / 70 °C 3: oxalyl chloride / CH2Cl2 / 20 h / 20 °C 4: tetrahydrofuran; hexane; acetonitrile / 4 h View Scheme

1: oxalyl chloride / CH2Cl2 / 20 h / 20 °C 2: tetrahydrofuran; hexane; acetonitrile / 4 h View Scheme

1: 1.26 g / KOH / methanol; H2O / 10 h / 70 °C 2: oxalyl chloride / CH2Cl2 / 20 h / 20 °C 3: tetrahydrofuran; hexane; acetonitrile / 4 h View Scheme

in tetrahydrofuran; hexane; acetonitrile 4 h;

1.1: 183 mg / rhodium (II) acetate dimer / CH2Cl2 / 1 h / Heating 2.1: phosphorus tribromide / CHCl3 / 1 h / 0 °C 2.2: 20 percent / CHCl3 / 1 h / Heating 3.1: 84 percent / DDQ / toluene / 15 h / Heating View Scheme