ammonium cerium(IV) nitrate in water; acetonitrile 1.) -7 deg C, 1 h, 2.) room temp., 2 h;

perchloric acid; ammonium cerium(IV) nitrate 1.) CH3CN, H2O, -7 deg C, 1 h, then room temp., 2 h, 2.) CH2Cl2, room temp., 4 h; Yield given. Multistep reaction;