Expanded Bacteriochlorins

Ruffled rings: Both pyrrolidine moieties in meso‐tetraaryl‐7,8,17,18‐tetrahydroxybacteriochlorins can be sequentially expanded into morpholine rings to give the first bacteriochlorin‐like derivatives containing two non‐pyrrolic heterocycles. These porphyrioids are characterized by nonplanar conformations and significantly red‐shifted optical spectra, both of which can be modulated by the introduction of linkages between β and o‐phenyl positions.