An analysis of 105 and 622 C–H ⋯ O bond geometries retrieved from 69 alkyne and 131 alkene structures in the Cambridge Structural Database shows that more acidic C–H groups tend to form stronger bonds but that even weak C–H ⋯ O bonds have pronounced linearity.
G. R. Desiraju, J. Chem. Soc., Chem. Commun., 1990, 454 DOI: 10.1039/C39900000454
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