| Abstract: | The mass spectra and the appearance potentials for the negative ions from a number of 4-substituted and 4,4′-disubstituted benzils, containing CH3, CH3O, CH3S, (CH3)2N and NO2 substituents have been measured. Molecular anions were observed for all benzils. The negative ion mass spectra of the CH3O- and CH3S-substituted compounds also exhibited ions resulting from loss of CH3 from the parent; Cl? was observed too in the spectra of the chlorine substituted benzils. Only for the nitrobenzils is more than one fragment ion observed in the spectra. A comparison of the negative ion spectra with the positive ion spectra previously reported is also presented and discussed. |
