disodium hydrogenphosphate; sodium amalgam in methanol T=0°C; 2 h;

1: 96 percent / Na-Hg, Na2HPO4 / methanol / 2 h / 0 °C 2: aq, NaHCO3, KBr, TEMPO, NaOCl / acetone / 2 h / 0 °C 3: diethyl ether 4: 100 percent / CF3COOH / CH2Cl2 / 1 h / Ambient temperature 5: 1.) aq. HCl, 2.) propylene oxide / 1.) 100 deg C, 3 h, 2.) EtOH, heating View Scheme