Microwave Spectrum, Structure, and Dipole Moment of Cyclopropylacetylene

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Abstract
The microwave spectra of cyclopropylacetylene and one deuterated species, C 3 H 5 C ≡ CD , have been analyzed. With certain assumed structural parameters, the C – C bond attaching the acetylenic group to the ring was found to have a length of 1.47 Å and the C ≡ C bond was 1.19 Å. These bond lengths are essentially indistinguishable from the corresponding distances in methylacetylene; the difference, if any, is in the opposite direction from that which would be predicted on the basis of either conjugative interactions or differences in hybridization. The dipole‐moment components are μ a =0.89 D , μ c =0.05 D , and μ total =0.89 D , nearly identical with that observed for pentyne.
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