The synthesis and characterization of the alkylidenyl-dibenzihexaphyrins bearing four indanedionyl groups at the meso-positions linked via four meso-exocyclic double bonds is reported. Treatment with trifluoroacetic acid at 50 °C leads to C(α)-protonation of the two indanedionyl groups resulting increased macrocyclic conjugation with dramatic red shifted absorption spectra.
S. Hong, R. Dutta, R. Kumar, Q. He, V. M. Lynch, J. L. Sessler and C. Lee, Chem. Commun., 2019, 55, 9693 DOI: 10.1039/C9CC04607K
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