14959-92-3Relevant articles and documents
Photochemistry of Biliverdin IXδ as a Model for the Study of the Photoproducts from Natural Biliverdin IXγ (Pterobilin)
Bois-Choussy, Michele,Barbier, Michel
, p. 1098 - 1110 (1980)
The configurations of biliverdin-IXγ and -IXδ dimethyl esters 1 and 2 in solutions, have been studied using Nuclear-Overhauser-Effect (NOE) experiments.Irradiation (500-700 nm) of biliverdin IXδ gave syn-Z -> anti-E isomerization of the central methine bridge and in aerated polar solutions, four new cyclized pigments were isolated for which structures 3, 4, 5 and 6 are proposed.Neobiliverdin IXδ is also formed in degassed solution (Φ = 4E-5) but pigments 4, 5 and 6 arise from photo-oxidation with O2.Biliverdin IXδ appears to be a good model for the study of photo-reactions occurring on the vinyl groups of the natural biliverdin IXγ (pterobilin).
Structurel Analysis of Tetrapyrroles by Hydrogen Chemical Ionization Mass Spectrometry
Shaw, George J.,Eglinton, Geoffrey,Quirke, J. Martin E.
, p. 2014 - 2020 (2007/10/02)
The H2 chemical ionization mass spectra of several standard porphyrins have been determined.Fragmentation proceeds via hydrogenation yielding porphyrinogens, followed by cleavage at the meso (bridge) positions to produce mono-, di-, and tripyrrolic ions.Secondary fragmentation by cleavage of substituent groups attached to the pyrrole rings may then occur.Identification of these fragments and the corresponding molecular ions produces considerable structural information on the parent molecule.In certain cases these data are sufficient to distinguish porphyrin type (positional) isomers.In addition information of substituents at meso positions may be retained.
