A series of substituted phenylacetylenes has been prepared and their infrared spectra recorded. The C≡C and ≡C—H stretching frequencies are only slightly affected by substituents in the phenyl ring. Substituents in the 4-position cause a splitting of the ≡C—H band into two clearly resolved bands of similar intensity, about 10 cm−1apart.
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Allen et al. (1963) studied this question.
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