Remarkably aromatic are the diaza[26]annulenes of type 1, which are stabilized by pyrrole rings positioned at the corners. This has been proven by 1H NMR spectroscopy, crystal structure analysis, and by electrophilic substitution reactions. In contrast, for the simple annulenes (CH)n, the aromaticity “stops” at the 22π electron system.
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Wessel et al. (1993) studied this question.
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