Chiral synthons containing either 13Cor 15N-labelled glycine were prepared. The 13C and 15N NMR spectra of the Ni(II) complex of the Schi † base of (S)-2-(N-benzylprolyl)aminobenzophenone and 13C-1-, 13C-2or 15N-labelled glycine were measured and assigned. The observed splitting of the carbon signal
Influence of the Z/E configuration on the 13C15N coupling conditions 1J(13C15N) in aromatic azo and diazo compounds
✍ Scribed by S. Simova; E. Fanghänel; R. Radeglia
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 417 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The ^13^C NMR spectra of singly ^15^N‐labelled Z/E isomers of azo and diazo compounds were recorded. The ^1^J(^13^C^15^N) coupling constants are strongly dependent on the geometrical configuration of the azo group, the relative position of the lone pair of electrons at the non‐coupling azo nitrogen atom having a decisive influence.
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## Abstract According to the ^1^H, ^13^C and ^15^N NMR spectroscopic data and DFT calculations, bifurcated NH···N and NH···O intramolecular hydrogen bond is shown to be present in 2‐trifluoroacetyl‐5‐(2′‐pyridyl)‐pyrrole. This bifurcated hydrogen bond causes an increase in the absolute size of th
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