Mass spectra of a series of 2‐p‐substituted phenyl‐1,3,2‐dioxaborolanes

The mass spectra of a series of 2‐p‐substituted phenyl‐1,3,2‐dioxaborolanes have been examined and compared with the mass spectrum of 2‐phenyl‐1,3,2‐dioxaborolane. Formation of the substituted ion [C7H6X]+ by electron impact induced rearrangement has been found to be influenced significantly by the presence and nature of the substituent at the para position of the phenyl ring.