ammonium acetate in dimethyl sulfoxide a) RT, 24 h, b) 75 deg C to 80 deg C, 2 h;

1: dioxane / 12 h / Heating 2: 79.5 percent / glacial CH3COOH, conc. H2SO4 / 3 h / Ambient temperature 3: 98.7 percent / 3 h / 125 - 130 °C 4: 82 percent / CH3COONH4 / dimethylsulfoxide / a) RT, 24 h, b) 75 deg C to 80 deg C, 2 h View Scheme

1: 98.7 percent / 3 h / 125 - 130 °C 2: 82 percent / CH3COONH4 / dimethylsulfoxide / a) RT, 24 h, b) 75 deg C to 80 deg C, 2 h View Scheme