Abstract
Abstract The rotational isomerism of methyl vinyl ether, ethyl vinyl ether, and n-butyl vinyl ether has been studied by means of the vibrational spectra and normal frequency calculations. The enthalpy difference between the skew and cis isomers in the liquid state of methyl vinyl ether has been determined to be 1440±160 cal/mol. Series of C–O torsional transitions in the cis well have been observed for methyl vinyl ether and methy-d3 vinyl ether in the region near 230 cm−1 and analyzed. It has been concluded for ethyl vinyl ether that the cis-trans form (CT) is stable in the solid state and that three forms, CT, SG′, and ST, coexist in the liquid and gaseous states. The spectra in the solid state of n-butyl vinyl ether are consistent with the calculated frequencies of the CTTT form.
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