Infrared and nuclear magnetic resonance studies of rotational isomerism in some acid fluorides
- 1 January 1970
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society B: Physical Organic
- p. 1719-1722
- https://doi.org/10.1039/j29700001719
Abstract
From the temperature dependence of the statistically averaged proton–fluorine spin–spin coupling constant 〈J〉T, the coupling constants associated with and the enthalpy difference between the stable isomers of a number of mono- and di-substituted acetyl fluorides have been determined by a least-squares method. JHF trans and JHF gauche were found to be of opposite sign in these molecules but the enthalpy differences determined were more comparable with the corresponding gas-phase values than with the liquid-phase value of 8·25 kJ mol–1 for chloroacetyl fluoride obtained from intensity studies of i.r. bands.Keywords
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