Small negative, one-bond, carbon-13 isotope effects on proton n.m.r. chemical shifts, i.e.1Δ1H(13C) values have been measured for a variety of compounds. A linear correlation between 1Δ1ΔH(13C) and 1JCH was discovered. Three compounds with short C–H bonds were found to deviate from the correlation. The behaviour of 1Δ1H(13C) was compared with that of 1Δ19F(13C) and 1Δ13C(2H).
J. R. Everett, J. Chem. Soc., Perkin Trans. 2, 1984, 1151 DOI: 10.1039/P29840001151
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