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How Should Aromaticity Be Described in Porphyrinoids?



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Porphyrins really are the [18]annulenes of nature”—This is the title of a report dealing with a new macrocycle (see structure; gray C, white H, blue N), which can be considered as either a porphyrin or an [18]annulene. The spectroscopic data prove the aromatic and porphyrinoid character of the new compound, and support the simple concept of a (4n+2)π main conjugation pathway as a key criterion for porphyrinoid Hückel aromaticity.

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