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High level ab initio structures for 3-ethynylcyclopropene contain a typical cyclopropene C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
C double bond of 1.296 Å, in sharp contrast to a recent X-ray structure in which the CC double bond (1.255(2) Å) is purported to be the shortest yet observed among all hydrocarbons.
S. S. Wesolowski, J. M. Gonzales, P. v. R. Schleyer and H. F. Schaefer III, Chem. Commun., 1999, 439 DOI: 10.1039/A809612K
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