1: With thiourea in ethanol T=50°C; 5.5 h; 2: With sodium hydroxide in water T=20°C; 1.5 h; 3: With acetic acid in water Cooling with ice;

1.1: trichlorophosphate; quinoline / 5.5 h / Reflux 1.2: Cooling with ice 2.1: thiourea / ethanol / 5.5 h / 50 °C 2.2: 1.5 h / 20 °C 2.3: Cooling with ice View Scheme

1.1: nitric acid; sulfuric acid / water / 1 h / 80 °C 2.1: trichlorophosphate; quinoline / 5.5 h / Reflux 2.2: Cooling with ice 3.1: thiourea / ethanol / 5.5 h / 50 °C 3.2: 1.5 h / 20 °C 3.3: Cooling with ice View Scheme

iron; acetic acid in water; ethyl acetate T=70°C; 0.166667 h;