1: 73 percent / acetic acid / 1 h / Heating 2: sulfuryl chloride / CH2Cl2 / 2 h / Ambient temperature 3: conc. sulfuric acid / 4 h / Ambient temperature View Scheme

1: sulfuryl chloride / CH2Cl2 / 2 h / Ambient temperature 2: conc. sulfuric acid / 4 h / Ambient temperature View Scheme

sulfuric acid 4 h; Ambient temperature; Yield given;