Potential energy barriers hindering internal rotation for a variety of fluorinated ethanes have been determined from spectroscopic and ultrasonic measurements. The reasons for the observed discrepancies in values obtained from the two methods are discussed. When allowance is made for these uncertainties the agreement between the values obtained by these two techniques is reasonable.
R. A. Pethrick and E. Wyn-Jones, J. Chem. Soc. A, 1971, 54 DOI: 10.1039/J19710000054
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