The most stable molecular conformation of ethyl vinyl ether in the vapor phase is shown to be a "sickle" shaped structure with all the heavy atoms coplanar. This conformation dominates the microwave rotational spectrum of this compound and no definitive evidence was found for the presence of other rotameric forms. Combined use of rotational and vibrational data has enabled several of the low frequency modes to be assigned to normal vibrations and evidence is presented to show that two of the skeletal torsional modes are comprehensively coupled together. The barrier to internal rotation of the methyl group (12.85 ± 0.1 kJ mol"1; 3.070 ± 0.025 kcal mol"1) has been determined from an analysis of the doublet lines seen for the two coupled torsional excited states, and also from splittings of high J high K transitions of the ground vibrational state. The dipole moment of ethyl vinyl ether was measured through the

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