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The intrinsic strength of the conjugation and hyperconjugation in 1,3‐butadiene, 1,3‐butadiyne, and related compounds was determined by energy decomposition analysis. The calculations indicate that the π conjugation in 1,3‐butadiyne is roughly twice as strong as that in 1,3‐butadiene, and that the hyperconjugative interactions of CH and CC bonds with CC multiple bonds are about half as strong as the π conjugation between multiple bonds.
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Cappel et al. (2005) studied this question.
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