Electron Impact Mass Spectra of 2-Dimethylaminomethyl-cyclohexanols and Their Ester Derivatives

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The mass spectra of 2-dimethylaminomethylcyclohexanols, their acetyl, their benzoyl and their cinnamoyl derivatives were measured by electron impact ionization.
The characteristic peak in the mass spectra of 2-dimethylaminomethylcyclohexanols and their ester derivatives is the fragment peak at m/z 58 which is the base peak. The structure of this fragment ion appears to be CH₂=N⁺(CH₃)₂.
The fragmentation mechanisms were elucidated with the aid of deuterium labeling measurement, metastable ion measurement and high resolution mass spectral measurement.