## Abstract The ^13^C NMR spectra of all __trans__‐styryldiazines, methyldiazines and __trans__‐styrylpyridines have been fully assigned. Empirical shift increments were obtained for the chemical shifts of the carbon atoms; these are discussed in the light of theoretical considerations.
13C NMR spectra of diazastilbenes. II—Torsion angles of trans-pyridinalanilines and trans-benzylideneaminopyridines
✍ Scribed by Egon Denecke; Klaus Müller; Thorsten Bluhm
- Book ID
- 102525517
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 282 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The torsion angles of trans‐pyridinalanilines and trans‐benzylideneanilines were derived from the chemical shifts of the para‐carbon atoms. The N‐torsion angle is between 33 and 59°. For the C‐torsion angle, a value of approximately 10° is obtained for the benzylideneaminopyridines and the C‐torsion angle for the pyridinalalines is estimated to be in the same range.
📜 SIMILAR VOLUMES
A detailed analysis of the -C NMR spectra of trans-stilbene and ten deuteriated trans-stilbenes has been undertaken. Some unusual deuterium isotope effects on carbon-hydrogen spin-spin coupling constants could not be explained by the ordinary primary and secondary isotope effects. The positive and n
The proton and carbon spectra of the title compounds were completely assigned by the use of 2D NMR techniques including 2D INADEQUATE. Contradictory assignments from the literature were clariÐed and incomplete data completed. The validity of the assignments of proton spectra was checked by computer