Corrole

A corrole is an aromatic organic chemical, whose structure is in the form of the corrin ring which is also present in cobalamin (vitamin B₁₂). The ring consists of nineteen carbon atoms, with four nitrogen atoms in the core of the molecule.

Corrole normally serves as a trianionic ligand with transition metals.

Corroles can be obtained in organic synthesis by a condensation reaction of a benzaldehyde with pyrrole in a water / methanol / hydrochloric acid mixture to an open-ring bilane (or tetrapyrrane) followed by oxidation and ring closure with p-chloranil ^[1]:

References

1. ^ Efficient Synthesis of meso-Substituted Corroles in an H2O-MeOH Mixture Beata Koszarna and Daniel T. Gryko J. Org. Chem.; 2006; 71(10) pp 3707 - 3717. doi:10.1021/jo060007k