sulfuric acid; water; acetic acid 4 h; Heating;

toluene-4-sulfonic acid; sulfur T=130°C; 10 h;

1: 88 percent / AlCl3 / CH2Cl2 / 0.5 h / -6 °C 2: 50.3 percent / sulfur, p-toluenesulfonic acid / 5 h / Heating View Scheme

1: 70 percent / HOAc, H2SO4, H2O / 4 h / Heating 2: 97 percent / conc. H2SO4 / toluene / 3 h / Heating 3: 56.7 percent / SnCl4 / CH2Cl2 / 2 h / Heating 4: 91 percent / aq. NaOH / methanol / 2 h / Ambient temperature 5: 51.5 percent / NBS, dibenzoyl peroxide / CCl4 / 2 h / Heating View Scheme