Abstract

AbstractThe complete set of deuterium‐induced intrinsic13C NMR isotope shifts,nΔ(13C), for norbornane have been determined from the isotopomeric monodeuteriated systems, and the results are discussed with respect to structure. No correlation is found between1Δ values and thescharacter of the CD bond hybrid. For vicinal isotope effects, however, a quantitative correlation with the dihedral angles of the intervening13C‐CCD bond fragment can be formulated: |3Δ(13C) | (ppb) = 2.2 + [7.3 × 10−3(ϕ −117.8)2]Negative3Δ values are found for bonding pathways in the five‐membered ring partial structure with anantiarrangement of the CCCD bond fragment.

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