Journal of the American Chemical Society p. 625 - 629 (1986)
Update date:2022-08-29
Topics:
Hansen, Poul Erik
Nicolaisen, Flemming M.
Schaumburg, Kjeld
Deuterium isotope effects on the 19F and 13C nuclear shieldings have been investigated in acyl derivatives.A nonadditivity of the 3ΔF(D) of acetyl fluoride has been experimentally established and related primarily to nonuniform rotamer distributions of the mono- and dideuteriated isotopomers.The 3ΔF(D)'s show furthermore a distinct orientational dependence.The isotope effects for the configurations where the nuclei in question are in a trans position are positive and those in which they are gauche are negative.The 2ΔCO(D)'s are negative and additive in all the investigated cases.The observed isotope effects are discussed in general in terms of substituent and vibrational effects.
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