potassium carbonate in N,N-dimethyl-formamide T=100 - 105°C; 3 h;

acetic anhydride 2 h; Heating;

1: 82 percent / potassium carbonate / dimethylformamide / 4 h / Heating 2: 76 percent / NH3 / ethanol / 72 h / Ambient temperature 3: 70 percent / aq. NaClO2, resorcinol / 2-methyl-propan-2-ol / 2.5 h / 30 - 40 °C 4: 20 percent / acetic anhydride / 3 h / Heating View Scheme

1: K2CO3 / dimethylformamide / 3 h / 100 - 105 °C 2: 82 percent / acetic anhydride / 2 h / Heating View Scheme

1: 76 percent / NH3 / ethanol / 72 h / Ambient temperature 2: 70 percent / aq. NaClO2, resorcinol / 2-methyl-propan-2-ol / 2.5 h / 30 - 40 °C 3: 20 percent / acetic anhydride / 3 h / Heating View Scheme