toluene-4-sulfonic acid; potassium iodide; sodium nitrite in water; acetonitrile T=0 - 20°C; 12.1667 h;

1: N-iodo-succinimide / benzene / 72 h / 20 °C 2: toluene-4-sulfonic acid; potassium iodide; sodium nitrite / water; acetonitrile / 12.17 h / 0 - 20 °C View Scheme