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

1: 59.4 percent / CH3COOH, conc. HCl / 3 h / Ambient temperature 2: 88 percent / 3 h / 125 - 130 °C 3: 89 percent / CH3COONH4 / dimethylsulfoxide / a) RT, 24 h, b) 75 deg C to 80 deg C, 2 h View Scheme

1: 77.7 percent / dioxane / 12 h / Heating 2: 59.4 percent / CH3COOH, conc. HCl / 3 h / Ambient temperature 3: 88 percent / 3 h / 125 - 130 °C 4: 89 percent / CH3COONH4 / dimethylsulfoxide / a) RT, 24 h, b) 75 deg C to 80 deg C, 2 h View Scheme

1: 88 percent / 3 h / 125 - 130 °C 2: 89 percent / CH3COONH4 / dimethylsulfoxide / a) RT, 24 h, b) 75 deg C to 80 deg C, 2 h View Scheme