Facile synthesis of unsubstituted β,β′-linked diformyldipyrromethanes
(Chemical Equation Presented) Unsubstituted β,β′-linked diformyldipyrromethanes are promising precursors for the synthesis of novel poly dipyrromethene ligands and N-confused porphyrins. A strategy has been developed to selectively synthesize unsubstituted β,β′-linked diformyldipyrromethanes in moderate yields starting from 2-formylpyrrole.