hydrogenchloride 4 h; Heating;

hydrogenchloride 10 h; Heating;

sodium hydroxide 3 h; Heating;

1: 75 percent / SOCl2 / 2 h / Heating 2: 77 percent / POCl3, DMF / 2 h / Heating View Scheme

thionyl chloride 2 h; Heating;

1: 75 percent / SOCl2 / 2 h / Heating 2: 77 percent / POCl3, DMF / 2 h / Heating 3: 9 percent / MCPBA / 1,2-dichloro-ethane / 39 h / 65 °C 4: 67 percent / K2CO3 / H2O / 2 h / Ambient temperature 5: 30 percent / 1 N NaOH / 2 h / Heating View Scheme