A highly selective hydrogen‐deuterium exchange in indolium heptamethine cyanines
- 1 October 1993
- journal article
- research article
- Published by Wiley in Journal of Heterocyclic Chemistry
- Vol. 30 (5) , 1177-1180
- https://doi.org/10.1002/jhet.5570300503
Abstract
Chemical shift assignments in 1H nmr spectra of four tricarbocyanines have been made. Studies by 1H 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.Keywords
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