Analysis of the NMR shifts of unsaturated carbon atoms in monounsaturated linear long-chain esters and acids, including new data from jojoba oil, rules out any explanation in terms of an ‘electric field effect’, but is semiquantitatively consistent with a ‘σ-inductive’ mechanism, having an attenuation factor of 1.75 per saturated C–C bond.
G. Bianchi, O. W. Howarth, C. J. Samuel and G. Vlahov, J. Chem. Soc., Chem. Commun., 1994, 627 DOI: 10.1039/C39940000627
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