Abstract
THE replacement of the hydrogen of a methine group in a number of conjugated organic compounds by an alkyl radical causes a batho- or hypso-chromic shift in the principal absorption maxima. This effect is particularly noticeable in methyl substitution, and could be explained by the hyperconjugation introduced by the methyl group.
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PIANKA, M., BARANY, H. & SMITH, C. Hyperconjugation and Light Absorption. Nature 167, 440 (1951). https://doi.org/10.1038/167440a0
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DOI: https://doi.org/10.1038/167440a0
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