From the as yet unknown [22]porphyrins(1.2.1.2) are derived the [22]annulenoquinones 1, which are accessible by a double Wittig reaction. All data indicate that 1 are real quinoid compounds and that the dianions are aromatic 22-π-electron systems (hydroquinones).
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Märkl et al. (1993) studied this question.
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