hyperconjugation

(redirected from Hyperconjugated)

hyperconjugation

[‚hī·pər‚kän·jə′gā·shən]
(physical chemistry)
An arrangement of bonds in a molecule that is similar to conjugation in its formulation and manifestations, but the effects are weaker; it occurs when a CH2 or CH3 group (or in general, an AR2 or AR3 group where A may be any polyvalent atom and R any atom or radical) is adjacent to a multiple bond or to a group containing an atom with a lone π-electron, π-electron pair or quartet, or π-electron vacancy; it can be sacrificial (relatively weak) or isovalent (stronger).