The X-ray crystal structure of 3-ethynylcyclopropene shows that the carbon–carbon double bond of the molecule is unusually short [1.255(2) Å], whereas theoretical calculations suggest a relative insensitivity of the bond length to adjacent orbital interactions.
K. K. Baldridge, B. Biggs, R. D. Gilbertson, M. M. Haley, D. Bläser, R. Boese, A. H. Maulitz and J. S. Siegel, Chem. Commun., 1998, 1137 DOI: 10.1039/A801217B
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