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

Ernest W. Della, Wit K. Janowski, Bruno Kasum, K. Paul Kirkbride, Neil J. Shirley

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    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.

    Original languageEnglish
    Pages (from-to)33-36
    Number of pages4
    JournalHeteroatom Chemistry
    Issue number1
    Publication statusPublished - 1 Feb 1992


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