Integrated i.r. intensities of both the ν8 ring-stretching and ν(C![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
C) bands of a series of m- and p-substituted phenylacetylenes indicate that the ethynyl group is a weak resonance donor when attached to a benzene ring. The group can become a strong resonance donor or acceptor in situations of high electron demand or excess, respectively.
T. B. Grindley, K. F. Johnson, A. R. Katritzky, H. J. Keogh and R. D. Topsom, J. Chem. Soc., Perkin Trans. 2, 1974, 273 DOI: 10.1039/P29740000273
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