| abstract |
Method of preparing a porphyrin derivative starting from a meso-substituted porphyrin compound. According to the invention, the meso-substituted porphyrin compound used is a meso-(2'-cyanovinyl)-substituted porphyrin compound, wherein said meso-(2'-cyanovinyl)-substituted porphyrin compound, in a form in which its porphyrin ring is complexed with a bivalent metal ion is converted, in the presente of an acid for which 0 < pKa < 5 and an oxidising agent; or in the presence of a Vilsmeier reagent, into a porphyrin derivative having a quinoline-ring system ring peri-condensed to the porphyrin ring. |