Pyrrolizinofluorene-embedded dithiacalixcorrole(1.0. 1 . 1 )s.

An unprecedented synthesis of pyrrolizinofluorene moiety embedded dithiacalixcorrole(1.0. 1 . 1 )s via [3 + 2] condensation of fluorene-based tripyrrane and appropriate bithiophene diol under TFA-catalyzed conditions is reported. Single crystal X-ray structural analysis revealed that the fluorene unit was inverted and involved in the intramolecular C-N bond formation, resulting in the generation of an unusual pyrrolizinofluorene moiety as part of the dithiacalixcorrole(1.0. 1 . 1 ) framework. These macrocycles exhibit strong absorption in the UV-visible region and electrochemical studies revealed their electron-rich nature.