1: 2.1386 g / 3 h / 260 - 280 °C / 0.4 Torr 2: 81 percent / tetrahydrofuran / 1 h / cooling 3: 99 percent / KOH / methanol; H2O / 30 h / 20 °C 4: 57 percent / 1,3-dicyclohexylcarbodiimide / CH2Cl2 / 20 h View Scheme

1: 2.1386 g / 3 h / 260 - 280 °C / 0.4 Torr 2: 81 percent / tetrahydrofuran / 1 h / cooling View Scheme

1: 2.1386 g / 3 h / 260 - 280 °C / 0.4 Torr 2: 81 percent / tetrahydrofuran / 1 h / cooling 3: 99 percent / KOH / methanol; H2O / 30 h / 20 °C View Scheme