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.
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