1: 2.) HCl / 1.) 120 deg C, 3 h, 2.) a.) 60 deg C, 4 h, b.) RT, 24 h 2: 52 percent / selenium dioxide / dioxane; H2O / 1.5 h / Heating 3: 62 percent / nitric acid / 3 h / Heating 4: Heating View Scheme

1: 2.) HCl / 1.) 120 deg C, 3 h, 2.) a.) 60 deg C, 4 h, b.) RT, 24 h 2: 52 percent / selenium dioxide / dioxane; H2O / 1.5 h / Heating View Scheme

1: 2.) HCl / 1.) 120 deg C, 3 h, 2.) a.) 60 deg C, 4 h, b.) RT, 24 h 2: 52 percent / selenium dioxide / dioxane; H2O / 1.5 h / Heating 3: 62 percent / nitric acid / 3 h / Heating View Scheme

hydrogenchloride 1.) 120 deg C, 3 h, 2.) a.) 60 deg C, 4 h, b.) RT, 24 h; Yield given. Multistep reaction. Yields of byproduct given;