The compound methylsilylacetylene has been prepared for the first time and its vibrational spectrum has been obtained and assigned. All but two of the fundamentals have been identified. The rotational Q branches of the perpendicular bands have been resolved for the three group modes of SiH3, and a comparison of the Coriolis coupling constants with those of other silyl-containing molecules indicates a low or vanishing barrier to internal rotation. The relative intensities of the Q branches further supports this observation.
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Robinson et al. (1962) studied this question.
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