potassium carbonate in acetone 21 h; Heating;

1: 95 percent / K2CO3, KI / acetone / 48 h / Heating 2: 64 percent / Na2S2O4, NaOH / dimethylformamide; H2O / 2 h / 70 °C 3: 72 percent / K2CO3 / acetone / 21 h / Heating View Scheme

1: 64 percent / Na2S2O4, NaOH / dimethylformamide; H2O / 2 h / 70 °C 2: 72 percent / K2CO3 / acetone / 21 h / Heating View Scheme

1: 100 percent / HBr / acetic acid / 16 h / Ambient temperature 2: 95 percent / K2CO3, KI / acetone / 48 h / Heating 3: 64 percent / Na2S2O4, NaOH / dimethylformamide; H2O / 2 h / 70 °C 4: 72 percent / K2CO3 / acetone / 21 h / Heating View Scheme

1: KOH / methanol; pyridine / 4 h / 135 °C 2: 88 percent / K2CO3 / acetone / 120 h / Heating 3: 57 percent / 2,6-di-tert-butyl-phenol, N,N-diethylaniline / 4 h / 200 °C 4: 87 percent / K2CO3 / acetone / 21 h / Heating View Scheme