1: 82 percent / p-Toluenesulfonic acid / benzene / 3 h / Heating View Scheme

toluene-4-sulfonic acid in benzene 3 h; Heating;

1: 82 percent / p-Toluenesulfonic acid / benzene / 3 h / Heating 2: sulfurated sodium borohydride / tetrahydrofuran / 16 h / Ambient temperature 3: 1.) NaNO2, 20percent H2SO4, 2.) KI / 1.) H2O, 0 deg C, 12 min, 2.) H2O, flask in aluminum foil, 30 min stirring View Scheme