sodium carbonate in water; benzene 18 h; Ambient temperature;

1: 1) potassium carbonate, 2) Cu / 1) water, RT, 2) dimethylformamide, reflux, 8 h 2: 62 percent / sodium carbonate / H2O; benzene / 18 h / Ambient temperature View Scheme

1: 1) potassium carbonate, 2) Cu / 1) water, RT, 2) dimethylformamide, reflux, 8 h 2: 62 percent / sodium carbonate / H2O; benzene / 18 h / Ambient temperature View Scheme

sodium hydride 1) dimethylacetamide, RT, 1h, 2) 60 deg C, 30 min, 3) RT, 4 h; Yield given. Multistep reaction;