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The behaviour of the title compounds under electron impact has been investigated using low and high resolution mass spectrometry and partial 15N and D labelling. A number of ions produced by rearrangement were observed. Abundant ions are formed by intramolecular ortho substitution reactions (cyclizations), as demonstrated by energetic and kinetic considerations and by studying the decomposition pathways of these ions. The ortho substitution processes involve loss or rearrangement of an ortho group of the aromatic ring.
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Bujtás et al. (1976) studied this question.
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