d-NMR-Untersuchung der behinderten Rotation am NC(X)-Bindungsfragment. XII. Substituenteneffekte auf die CN-Rotationsbarriere in unterschiedlich N-substituierten Carbamidsäure-O-ethylestern
✍ Scribed by Dr. E. Kleinpeter; M. Kretschmer; Prof. Dr. R. Borsdorf; Dr. R. Widera; Prof. Dr. M. Mühlstädt
- Book ID
- 105352205
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- English
- Weight
- 272 KB
- Volume
- 322
- Category
- Article
- ISSN
- 1615-4150
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✦ Synopsis
d‐N.M.R.‐Investigation of the Restricted Rotation at the NC(X)‐Bonding Fragment. XII. CN‐Rotational Barrier in Different N‐Substituted Carbamic Acid O‐ethyl Esters
The ^1^H‐n.m.r. spectra of a series of different N‐substituted urethanes R^1^R^2^N‐C(O)OC~2~H~5~ are studied at various temperatures. At low temperatures the syn/anti rotamers are assigned by using the LIS‐values of the protons. The thermodynamic parameters ΔG~C~± of the restricted rotation about the partial C‐N double bond are determined and discussed with regard to inductive, conjugative and homoconjugative effects of the N‐substituents.