potassium hydroxide in tetrahydrofuran; water 2 h;

dihydrogen peroxide in acetic acid 24 h; Ambient temperature1.) CCl4, irradiation, 1.5, 2.) CH2Cl2, 0 deg C, 30 min then 30 min, RT;

Irradiationphotochemical selenosulfonation;

1: 54 percent / sulfuric acid / pentane / 0.5 h / 0 °C / further reagent trifluoroacetic acid 2: 8 percent / cupric chloride, TDA-1 / various solvent(s) / 11 h / 120 - 124 °C 3: 92 percent / MCPBA / CH2Cl2 / 1.5 h / Ambient temperature 4: 91 percent / potassium hydroxide / H2O; tetrahydrofuran / 2 h View Scheme

1: 8 percent / cupric chloride, TDA-1 / various solvent(s) / 11 h / 120 - 124 °C 2: 92 percent / MCPBA / CH2Cl2 / 1.5 h / Ambient temperature 3: 91 percent / potassium hydroxide / H2O; tetrahydrofuran / 2 h View Scheme

1: 92 percent / MCPBA / CH2Cl2 / 1.5 h / Ambient temperature 2: 91 percent / potassium hydroxide / H2O; tetrahydrofuran / 2 h View Scheme