Porphyrins. 10. New data on the polyformylation of metal complexes of octaethylporphyrin

A New Route to meso-Formyl Porphyrins

“…The removal of copper generally requires strongly acidic conditions such as TFA in H 2 SO 4 . The yield of the Vilsmeier formylation is typically quite high (though mixtures of polyformylated metalloporphyrins are known ,, ). However, the requirement for a three-step procedure, use of strong acid, and limited control over the site of formylation presents obvious limitations.…”