The far infrared absorption spectrum of 2,5-dihydrofuran was measured in the 500–50-cm−1 region. A successive series in the spectrum was observed. The analysis of the series leads to the following ring-puckering potential as a function of the ring-puckering coordinate Z: V(Z)=1.557×104Z2+1.152×106Z4 (V in cm−1, Z in angstroms). No potential hump is found in this molecule. The origin of the potential and the treatment of higher-order terms in the kinetic energy are discussed.
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Ueda et al. (1967) studied this question.
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