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Stereochemistry of crown ethers. I. Conformational and dynamic behaviour of N ‐tosyl‐substituted diaza crown ethers
Author(s) -
Kleinpeter E.,
Gäbler M.,
Schroth W.
Publication year - 1988
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260260507
Subject(s) - conformational isomerism , chemistry , tosyl , ring (chemistry) , crown (dentistry) , ring size , nmr spectra database , stereochemistry , nuclear magnetic resonance spectroscopy , crystallography , computational chemistry , spectral line , organic chemistry , molecule , medicine , dentistry , physics , astronomy
The variable‐temperature 1 H and 13 C NMR spectra of some N ‐tosyl diaza crown ethers have been obtained. They are discussed with respect to the preferred conformers of the crowns and the free energies of activation of the interconversional process of the large ring. Both the preferred conformers and the ring interconversional barriers have been found to be strongly dependent on the structure and the ring size of the studied compounds.