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Changes in the i.r. spectra of saturated esters between –110° and +40° suggest that in methyl propionate and methyl n-butyrate there is an equilibrium between the eclipsed and the gauche forms of the alkyl group with enthalpy (ΔH) differences between these forms of 78 ± 50 cal.mole.–1 and 182 ± 60 cal.mole–1 respectively.
A. J. Bowles, W. O. George and D. B. Cunliffe-Jones, J. Chem. Soc. D, 1970, 103 DOI: 10.1039/C29700000103
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