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A highly selective hydrogen‐deuterium exchange in indolium heptamethine cyanines
Author(s) -
Lipowska Malgorzata,
Patterson Steven E.,
Patonay Gabor,
Strekowski Lucjan
Publication year - 1993
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570300503
Subject(s) - chemistry , hydrogen–deuterium exchange , deuterium , catalysis , proton , proton nmr , base (topology) , hydrogen , deuterium nmr , photochemistry , carbon 13 nmr , stereochemistry , organic chemistry , nuclear physics , mathematical analysis , physics , mathematics
Chemical shift assignments in 1 H nmr spectra of four tricarbocyanines have been made. Studies by 1 H nmr have shown a rapid acid‐catalyzed proton exchange at positions 1′,7′ and a much slower exchange at positions 3′,5′ of the heptamethine chain. Base catalysis results in a slow exchange at positions 1′,7′ only.