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Massenspektrometrische Untersuchung des Substituenteneffektes bei einfach substituierten Benzophenonen

Mass spectrometric studies of the substituent effect on monosubstituted benzophenones

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Ionization potentials of benzophenone and six meta- and parasubstituted benzophenones have been measured and correlated withBrown σ +-constants. The ρ-value of this correlation gives evidence that the ionization process of benzophenones is similar to the ionization process of compounds with one benzene ring: removal of an electron from the π-electron system.

Appearance potentials of the benzoyl ions and the corresponding six substituted benzoyl ions have been determined and correlated withHammett σ-constants. The deviations of ions with the substituents m-NH2 and p-NH2 from the correlation line are mainly due to the kinetic shift of these ions.

For the decomposition of benzophenone ions to benzoyl ions the correlation of metastable-ion intensities withHammett σ-constants shows a similar ρ-value as the correlation of the intensities of the decomposition in the ion source.

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Heller, R., Varmuza, K. & Krenmayr, P. Massenspektrometrische Untersuchung des Substituenteneffektes bei einfach substituierten Benzophenonen. Monatshefte für Chemie 105, 787–795 (1974). https://doi.org/10.1007/BF00912977

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