isovalent hyperconjugation

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isovalent hyperconjugation [¦ī·sə¦vā·lənt ‚hī·pər‚kän·jə′gā·shən]

(physical chemistry)

An arrangement of bonds in a hyperconjugated molecule such that the number of bonds is the same in the two resonance structures but the second structure is energetically less favorable than the first structure; examples are H₃≡C‒C⁺H₂and H₃≡C‒CH₂.

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