selenium(IV) oxide in 1,4-dioxane 5.5 h; Heating;

1: 70 percent / sulfuric acid / 4 h / Heating 2: 70 percent / sodium borohydride / methanol / 17 h / Heating 3: 90 percent / selenium dioxide / dioxane / 5.5 h / Heating View Scheme

1: 90 percent / hydrogen iodide; phosphorous acid / 5 h / Heating 2: 70 percent / sulfuric acid / 4 h / Heating 3: 70 percent / sodium borohydride / methanol / 17 h / Heating 4: 90 percent / selenium dioxide / dioxane / 5.5 h / Heating View Scheme

1: 70 percent / sodium borohydride / methanol / 17 h / Heating 2: 90 percent / selenium dioxide / dioxane / 5.5 h / Heating View Scheme