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Extending conjugation: Azulene-fused porphyrins (see example) are synthesized through the oxidation of meso-(4-azulenyl)porphyrins with FeCl3. The azulene-fused strategy allowed highly π-conjugated porphyrinic electronic systems, which are promising two-photon absorption pigments, to be realized.
Kurotobi et al. (2006) studied this question.
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