1: 1.) ammonium persulfate, trifluoromethanesulfonic acid / 1.) acetonitrile, RT, 15 min, 2.) acetonitrile, RT 2: hydrogen peroxide / methanol View Scheme

(NH4)2S2O8; trifluorormethanesulfonic acid 1.) acetonitrile, RT, 15 min, 2.) acetonitrile, RT; Yield given. Multistep reaction;