sodium ethanolate in ethanol 2 h; Heating;

soude in water 1 h;

1: 72 percent / thiourea / ethanol / 6.5 h / Heating 2: 90 percent / soude / H2O / 1 h View Scheme

1: 62 percent / SeO2 / dioxane / 6 h / Heating 2: 82 percent / hydrure de sodium / tetrahydrofuran / 2.5 h / 30 - 40 °C 3: 100 percent / Br2 / CCl4 / 2 h / 15 - 20 °C 4: 15 percent / chlorure de pyridinium / 0.33 h / Heating View Scheme