ammonium cerium(IV) nitrate in water; acetonitrile 0.5 h; Ambient temperature;

1: 96 percent / aq. NaOH / methanol / Ambient temperature 2: 85 percent / PBr3 / tetrahydrofuran / 1.) 0 deg C, 10 min, 2.) RT, overnight 3: 83 percent / Ce(NH4)2(NO3)6 / acetonitrile; H2O View Scheme