NMR studies of the chalcogen analogues of benzofuran. IV—Proton, carbon-13 and selenium-77 magnetic resonance in nitrobenzo[b]selenophenes
✍ Scribed by Marcel Baiwir; Gabriel Llabrès; Léon Christiaens; Jean-Louis Piette
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 444 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The ^1^H, ^13^C and ^77^Se chemical shifts have been measured for mononitrobenzo[b]selenophenes. For the homocyclic nuclei, the observed ^1^H‐ and ^13^C‐values calculated from the empirical increments of nitrobenzene. Anomalous effects are observed in the 2‐ and 3‐substituted derivatives and the nature of the SeNO~2~ interactions in the former is discussed. ^77^Se chemical shifts of the 4‐, 5‐ and 7‐nitro derivatives are approximately correlated with the CNDO calculated electron densities; they also compare well with those of selenoanisoles and other phenyl alkyl selenides. The chemical shifts are also compared with the corresponding values in other heterocycles containing a selenophene moiety.