Electrochemical synthesis of a thiophene-containing cyclo[9]pyrrole

A new member of the cyclon]pyrrole class of expanded porphyrins could be prepared from the corresponding thiophene-containing terpyrrole precursor through use of a mild electrochemical oxidative procedure. The isolated macrocycle, featuring nine heterocyclic subunits directly connected through their α,α'-positions, is the largest cyclon]pyrrole derivative reported to date (see figure).