toluene-4-sulfonic acid in acetic acid T=90 - 92°C; 8 h; Yield given;

1: 92 percent / NH4SCN / acetone / 1 h / Ambient temperature 2: K2CO3 / methanol; H2O / 9 h / Heating 3: p-toluenesulfonic acid / acetic acid / 8 h / 90 - 92 °C View Scheme

1: Na2CO3 / dimethylformamide / 2.5 h / Ambient temperature 2: 4.8percent aq. NaOH / benzene; dimethylformamide; H2O / 1 h / 8 °C 3: 92 percent / NH4SCN / acetone / 1 h / Ambient temperature 4: K2CO3 / methanol; H2O / 9 h / Heating 5: p-toluenesulfonic acid / acetic acid / 8 h / 90 - 92 °C View Scheme

1: K2CO3 / methanol; H2O / 9 h / Heating 2: p-toluenesulfonic acid / acetic acid / 8 h / 90 - 92 °C View Scheme