Abstract
Microwave spectra of chloromethylmethylether and its 21 isotopically substituted species were measured. The r s structure of this molecule was determined from the observed moments of inertia under several assumptions which were necessary to avoid the use of unreliable r s coordinate values. Structural parameters obtained for this molecule are roughly close to those reported by Ikeda et al. [ J. Mol. Spectrosc. 53, 101 (1974)]. However, one of three CH bond lengths for the methyl group exhibits a remarkably high value (1.130 Å). From the structure obtained, the barrier to internal rotation of the methyl group was calculated taking into account the coupling effect with the skeletal torsion.
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