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Analysis of unusual 13C77Se couplings in the 13C NMR spectra of selenoimidates

✍ Scribed by R. H. Contreras; M. C. Ruíz de Azúa; C. G. Giribet

Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
556 KB
Volume
24
Category
Article
ISSN
0749-1581

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✦ Synopsis

The dilference between cis and trans "C-"Se couplings reported recently for selenoimidates is analyzed using the IPPP-INDO method, which allows a study of the stereochemical behaviour of dilferently transmitted components of electron-mediated spin-spin coupling constants. It is concluded that a large through-space transmission of the Fermi contact term takes place for the cis %-''Se coupling via an Se-electron-pair * * -€I-C bond coupling pathway. The influence of the steric compression of the Se-electron pairs on the one-bond 13C-?3e couplings is also discussed.

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