1,2-bis-Dipyrrinon-9-yl-ethene - a Novel b-homo-Verdin Chromophore: the Reaction of 9-Methyl-10H-dipyrrin-1-ones with Bromine

Article abstract of DOI:10.1007/BF00811018

Upon treatment of 9-methyl-10H-dipyrrin-1-ones with bromine in dichloromethane, red bile pigment derivatives were obtained in moderate yields.They were structurally assigned as 1,2-bis-dipyrrinon-9-yl-ethenes, which are examples of the hitherto unknown b-homo-verdins.In addition, the corresponding meso-biliverdins-XIIIα could be isolated from the reaction mixture.The mechanistic aspects of the reaction are discussed. - Keywords: 1,2-bis-Dipyrrinon-9-yl-ethene; b-homo-Verdin; Mesobiliverdin-XIIIα