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Azobilirubin isomers: NMR structure determination using a shift reagent
Author(s) -
Salmón Manuel,
Díaz E.,
Rock M. C.,
Fenselau Catherine
Publication year - 1976
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270080304
Subject(s) - substituent , reagent , chemistry , lanthanide , chemical shift , medicinal chemistry , organic chemistry , ion
The isomeric benzeneazodipyrromethene derivatives, obtained from the reaction of bilirubin and a phenyldiazonium salt were separated as their corresponding methyl esters. The lanthanide‐induced chemical shifts, coupling constants and double irradiation experiments permit direct assignment of methyl and vinyl substituent positions in these bilirubin‐derived isomers.