The low resolution microwave spectrum of gaseous 2,2,2hyphen;trifluoroethyl vinyl ether displays an intense series ofahyphen;type bands and a weakbhyphen;type series which identify the species to have anshyphen;cishyphen;planar configuration, tgr; (C=Cndash;Ondash;C) = 0deg; and tgr; (Cndash;Ondash;Cndash;CF3) = 180deg; lsqb;Fig. 1(b)rsqb;. 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 anshyphen;transhyphen;planar species, tgr; (C=Cndash;Ondash;C) = 180deg; and tgr; (Cndash;Ondash;Cndash;CF3) = 180deg; lsqb;Fig. 1(d)rsqb;. Any other species significantly present in the vapor would have to be relatively nonpolar, i.e., have tgr; (Cndash;Ondash;Cndash;CF3) 90deg;.
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