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13C Chemical shifts and 13C15N coupling constants of some 15N-labelled bridgehead nitro compounds

✍ Scribed by Ernest W. Della; Wit K. Janowski; Bruno Kasum; K. Paul Kirkbride; Neil J. Shirley

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
332 KB
Volume
3
Category
Article
ISSN
1042-7163

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✦ Synopsis

Abstract

Measurement of the ^13^C NMR spectra of the bridgehead nitro compounds 1a–5a has been performed. It is found that one‐bond ^13^C^15^N coupling is not necessarily a reflection of the degree of s character of the bridgehead carbon exocyclic bonding orbital. Although the magnitude of vicinal coupling to the bridgehead carbon increases, in accordance with the number of three‐bond pathways available for transmission of spin information, coupling is actually reduced by opposing contributions from through‐space intramolecular orbital interactions.

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