2,3,5,6,8,9-Hexakis(phenoxycarbonyl)sumanene, a hexasubstituted sumanene with CO2Ph groups at the peripheral aromatic carbons, was successfully prepared in good yield by Pd-catalyzed phenoxycarbonylation using a solvent of phenyl formate. Single-crystal X-ray structural analysis of this compound revealed the formation of a one-dimensional columnar structure, stacked in a staggered manner. The UV and emission spectra of this showed clear red-shifts compared with those of pristine sumanene, indicating the extension of the conjugation system.
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