1: 70 percent / benzene / 4 h / Heating 2: 98 percent / K2CO3 / ethanol / 12 h / Ambient temperature 3: 100 percent / Et3N, (N,N-dimethylamino)pyridine / CH2Cl2 / 2 h / 0 °C 4: 70 percent / benzene / 24 h / Ambient temperature 5: 100 percent / 4 N aq. KOH / benzene / 24 h / Heating View Scheme

1: 70 percent / benzene / 4 h / Heating 2: 98 percent / K2CO3 / ethanol / 12 h / Ambient temperature View Scheme