On the Chemistry of Bile Pigments, LXXXIII: The Influence of Charged Centers on the Absorption Spectra of 1,19-Bilindiones

Article abstract of DOI:10.1007/BF00810295

Model systems consisting of 10-phenyl-bilin-1,19-diones substituted in 2- and 4-positions of the phenyl ring with carboxy or amino groups are synthesized by condensating appropriately substituted benzaldehydes with dipyrrinones.These systems provide a def