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Stereochemistry of crown ethers. I. Conformational and dynamic behaviour of N-tosyl-substituted diaza crown ethers

✍ Scribed by E. Kleinpeter; M. Gäbler; W. Schroth

Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
405 KB
Volume
26
Category
Article
ISSN
0749-1581

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✦ Synopsis

The variable-temperature 'H and 13C 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. KEY WORDS Variable-temperature 'H and I3C NMR spectra N-tosyl diaza crown ethers Crown conformation Free energies of activation

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