trichlorophosphate 0.5 h; Heating;

1.1: ethanol / Reflux 2.1: nitric acid; sulfuric acid / 72 h / 0 - 100 °C 3.1: sodium / 0.17 h / Inert atmosphere 3.2: 3 h / Inert atmosphere; Reflux 4.1: thionyl chloride / N,N-dimethyl-formamide / 4 h / Reflux View Scheme

1.1: nitric acid; sulfuric acid / 72 h / 0 - 100 °C 2.1: sodium / 0.17 h / Inert atmosphere 2.2: 3 h / Inert atmosphere; Reflux 3.1: thionyl chloride / N,N-dimethyl-formamide / 4 h / Reflux View Scheme

1.1: sodium / 0.17 h / Inert atmosphere 1.2: 3 h / Inert atmosphere; Reflux 2.1: thionyl chloride / N,N-dimethyl-formamide / 4 h / Reflux View Scheme

1: 97 percent / Na / 18 h / 100 °C 2: 93 percent / POCl3 / 0.5 h / Heating View Scheme