Abstract
Propynyl boron difluoride, CH 3C≡CBF2, has been synthesized for the first time and its infrared spectrum determined over the 4000–250-cm−1 region. All 20 fundamentals have been assigned based on band shape considerations, characteristic group frequencies, or isotopic splitting. The gas phase spectrum was compatible with a molecular model belonging to the G12 symmetry group for nonrigid structures. Resolved Q-branch structure was observed for the asymmetric methyl stretching fundamental ν8(e′) which resulted from the freely rotating methyl group. The Coriolis coupling coefficient for this mode was estimated to be ζ 8= +0.16.
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