A New Approach to the Preparation of 1,3,4-Triarylpyrroles

A class of 1,3,4-triaryl-2,5-dihydropyrroles were synthesized using the McMurry coupling reaction as the key step. The noncatalytic photoconversion of 1,3,4-triaryl-2,5-dihydropyrroles furnished 1,3,4-triarylpyrroles in good yields (63-89%). It was found that the photoconversion was facile and very reliable; the ­solvent was found to play an important role.