in toluene T=20°C;

1.1: sodium hydride / tetrahydrofuran / 0.5 h / 20 °C 1.2: tetrahydrofuran / 1 h / 20 °C 2.1: tetrahydrofuran / 2 h / Heating View Scheme

1: sodium ethanolate / ethanol / 0.01 h / 15001.5 Torr / |Reflux; |Microwave irradiation 2: trichlorophosphate / 0.08 h / 120 °C / 22502.3 Torr / |Microwave irradiation 3: toluene / 20 °C View Scheme

1: sulfuric acid / 1 h / 20 °C 2: sodium ethanolate / ethanol / 0.01 h / 15001.5 Torr / |Reflux; |Microwave irradiation 3: trichlorophosphate / 0.08 h / 120 °C / 22502.3 Torr / |Microwave irradiation 4: toluene / 20 °C View Scheme

in tetrahydrofuran 2 h; Heating;