3: n-Bu4NF / hexamethylphosphoric acid triamide / 2 h / 40 °C 4: 1 M HCl / acetone / 1.5 h / Ambient temperature 5: 30 percent / 0.5 M Na2CO3, 0.5 M K3Fe(CN)6 / 3 h at 0 deg C, then 14 h at 25 deg C View Scheme

3: n-Bu4NF / hexamethylphosphoric acid triamide / 2 h / 40 °C 4: 1 M HCl / acetone / 1.5 h / Ambient temperature 5: 30 percent / 0.5 M Na2CO3, 0.5 M K3Fe(CN)6 / 3 h at 0 deg C, then 14 h at 25 deg C 6: diethyl ether View Scheme

potassium carbonate in acetone 12 h; Heating;