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Selenium-77 magnetic resonance in SSe and SeSe isosteres of phenanthrene

✍ Scribed by Marcel Baiwir; Gabriel Llabrès; Jean-Louis Piette; LÉOn Christiaens

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
263 KB
Volume
14
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Selenium‐77 magnetic resonance spectra of sulphur‐selenium and selenium‐selenium isosteres of phenanthrene and some of their 2‐substituted derivatives have been recorded and 48 ^77^Se chemical shifts are presented. The two isomers of the studied compounds could be differentiated because the Se nucleus is always more shielded in the ‘trans’ than in the ‘cis’ isomer, the difference varying between 10 and 40 ppm. CNDO calculations have been performed; they allow an electronic model to be proposed which accounts, at least qualitatively, for the NMR results. They also provide an electronic interpretation of the ring opening of the Se‐containing ‘cis’ isomers when treated with alkyllithium.

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