1: 70 percent / sodium acetate / acetic acid; acetic anhydride / 1.5 h / Heating 2: 100 percent / 2N aq. NaOH / 1 h / Heating 3: 24 percent / copper powder / diphenyl ether / 3 h / Heating 4: 70 percent / DDQ / benzene / 4 h / Heating 5: 75 percent / anhydrous potassium carbonate / acetone / 6 h / Heating View Scheme

1: 70 percent / sodium acetate / acetic acid; acetic anhydride / 1.5 h / Heating 2: 100 percent / 2N aq. NaOH / 1 h / Heating 3: 24 percent / copper powder / diphenyl ether / 3 h / Heating 4: 70 percent / DDQ / benzene / 4 h / Heating View Scheme