3.3 Gas-Phase Smiles Rearrangement of ortho-nitro diaryliodonium cations
In order to clearly explain the gas-phase O-atom transfer reaction mechanism of [Mes-I+-(o -NO2-C6H4)] from salt 5 to the dominating fragment ion [MesO]+, we further studied the tandem mass spectra of some [Ar1-I+-(o -NO2-C6H4)] cations with different Ar1 from salts9 ~12 (shown in Scheme 1 ) and these [Ar1-I+-(o -NO2-C6H4)] cations all exhibited the oxygen-atom transfer product ions [Ar1O]+ by loss of neutral [o -NO-Ar2I] (shown in Figure 3 ).