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The first highly-resolved 19F n.m.r. spectra in the gas-phase have been observed for 1,2-difluoroethane, and the conformational energy difference between the gauche and trans states has been estimated to be about –0.8 kcal/mol (1 kcal = 4.184 kJ) from the coupling constants observed in the 19F and 1H n.m.r. spectra.
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Hirano et al. (1986) studied this question.
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