MASS-SPECTROMETRIC INVESTIGATION OF SOME 2-SUBSTITUTED 1,4-NAPHTOQUINONES

Abstract

The mass spectra of nine derivatives of 2-substituted 1,4-naphthoquinones are considered and their comparative analysis is carried out. The characteristics of the reaction of the fragmentation of their molecular ions under conditions of ionization by electrons are characterized and shown. It was revealed that under the conditions of mass spectrometry, the stability of the molecular ion of methyl, amino, ethyl, methoxy, acetyl, and methylthio-substituted 1,4-naphthoquinones (2-8) remains high, as in 1,4-naphthoquinone (1). It is established that the nature of the substituent affects the nature of fragmentation. It was shown that the introduction of acetyloxy- (in case 9) and phenyl (in case 10) into the structure of 1,4-naphthoquinone leads to destabilization of the molecular ion.

References

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