Turcasarin, the Largest Expanded Porphyrin to Date

40π-Electrons and ten pyrrole units are found in macrocycle 1, the largest expanded porphyrin reported thus far. The tetrahydrochloride salt of 1 was characterized in solution and in the solid state. These investigations indicate that the macrocycle exists as a pair of enantiomers whose chirality arises from a twist of the ring.