Efficient Synthesis of Novel Bis(dipyrromethanes) with Versatile Linkers via Indium(III) Chloride-Catalyzed Condensation of Pyrrole and Dialdehydes

A new efficient and mild protocol for synthesizing a series of novel bis(dipyrromethanes) with versatile arylene linkers through an indi- um(III) chloride-catalyzed condensation reaction between various dialdehydes and pyrrole has been developed. This protocol is applicable to constructing a variety of bis(dipyrromethanes) with diverse functional linkers, which provides a powerful route to construct libraries of functionalized porphyrin dimers and even multiporphyrin arrays.