The integrated intensities of the C![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
C stretching vibrations are recorded for series of 2-substituted t-butyl- and phenyl-acetylenes. These intensities are related to the resonance effects of the substituents; such resonance interaction is shown to involve both the acetylene π-orbitals.
T. B. Grindley, K. F. Johnson, A. R. Katritzky, H. J. Keogh, C. Thirkettle and R. D. Topsom, J. Chem. Soc., Perkin Trans. 2, 1974, 282 DOI: 10.1039/P29740000282
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