hyperconjugation

noun

hy·per·conjugation

Definition of hyperconjugation

: resonance in an organic chemical structure that involves as part of the resonance hybrid the separation of a proton from a methyl or other alkyl group situated next to an electron-deficient unit (as a double bond or carbonium ion), the electrons released by the proton tending to move toward the electron-deficient function with resultant stabilization of the entire structure (as in a trisubstituted propylene H−CH₂CR=CR₂↔H⁺CH₂=CR−CR₂⁻)

— called also no-bond resonance

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