potassium fluoride; 18-crown-6 ether in acetonitrile Heating;

1: 63 percent / aq. KOH / methanol / Heating 2: 50 percent / Ac2O / Heating 3: 41 percent / diethyl ether / reflux, 2 h -> room temperature 4: 28 percent / KF, 18-crown-6-ether / acetonitrile / Heating View Scheme

1: 41 percent / diethyl ether / reflux, 2 h -> room temperature 2: 28 percent / KF, 18-crown-6-ether / acetonitrile / Heating View Scheme

1: 50 percent / Ac2O / Heating 2: 41 percent / diethyl ether / reflux, 2 h -> room temperature 3: 28 percent / KF, 18-crown-6-ether / acetonitrile / Heating View Scheme

1: 60 percent / benzene / 1 h / 70 °C 2: 63 percent / aq. KOH / methanol / Heating 3: 50 percent / Ac2O / Heating 4: 41 percent / diethyl ether / reflux, 2 h -> room temperature 5: 28 percent / KF, 18-crown-6-ether / acetonitrile / Heating View Scheme

1: 45 percent / Zn, NH4Cl / aq. ethanol / 5 h / 10 - 15 °C 2: 58 percent / 1 h / Heating View Scheme