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2-Formylpyrroles react in the presence of cobalt ions to afford a mixture of porphyrin and corrole cobalt complexes. This is the first example of a single step synthesis of meso-unsubstituted corrole from a monopyrrole. When 3-ethyl-4-methyl-2-formylpyrrole-5-carboxylic acid was used as starting material, Co(Etioporphyrin-I) and a mixture of cobalt corrolates were obtained. Chromatographic separation...
2-(α-Hydroxyalkyl)pyrroles react in the presence of cobalt ions leading to the formation of corrolates or porphyrinates as a function of the 2-substituents. The nature of the cyclic tetrapyrrole obtained can be related to the steric hindrance of the substituent present in the starting pyrrole. The presence of cobalt ions is essential to drive the reaction towards the formation of the contracted...
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