Condensation of 1-formyl-3-haloisoindoles with α-free pyrroles in the presence of hydrogen bromide gives the corresponding benzopyrromethene hydrobromides: heating α-halo-α′-methylbenzopyrromethene hydrobromides in o-dichlorobenzene in air provides an economical synthesis of the opp-dibenzoporphyrin system in acceptable yields.
R. Bonnett and K. A. McManus, J. Chem. Soc., Chem. Commun., 1994, 1129 DOI: 10.1039/C39940001129
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