Low resolution microwave spectroscopy. II. The conformation of 2,2,2-trifluoroethyl vinyl ether

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Abstract
The low resolution microwave spectrum of gaseous 2,2,2-trifluoroethyl vinyl ether displays an intense series of a-type bands and a weak b-type series which identify the species to have an s-cis-planar configuration, τ (C=C–O–C) = 0° and τ (C–O–C–CF3) = 180° [Fig. 1(b)]. This confirms the determination by Charles, Cullen, and Owen based on infrared evidence and analogy to unsubstituted ethyl vinyl ether. No other species is observed which excludes any significant population of an s-trans-planar species, τ (C=C–O–C) = 180° and τ (C–O–C–CF3) = 180° [Fig. 1(d)]. Any other species significantly present in the vapor would have to be relatively nonpolar, i.e., have τ (C–O–C–CF3) < 90°.