Vibrational spectra and conformations of vinyloxirane

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Abstract
The infrared spectra of gaseous and solid vinyloxirane have been recorded, while Raman spectra of all three physical states have been obtained. The vibrational data for the liquid and vapor phases are consistent with the presence of three conformations, the s‐trans and two nonequivalent gauche forms. The energy separations between the most stable s‐trans and each of the other confromers have been determined for the liquid state to be 1.1 ± 0.2 and 0.8 ± 0.2 kcal mol−1 by measuring the temperature dependence of sets of Raman lines. A complete vibrational assignment is proposed for the s‐trans conformer, and the identities of the less stable conformers are discussed in terms of previous studies of related molecules.