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what is REVERSE HYPERCONJUGATION?

what is REVERSE HYPERCONJUGATION?

Grade:12

1 Answers

Aarti Gupta
askIITians Faculty 300 Points
9 years ago
The delocalization of sigma electrons or lone pair of electrons into adjacent pi orbital or p-orbital is called the hyperconjugation.This occurs due to overlapping of sigma bonding orbital or orbital containing a lone pair with adjacent pi orbital or p-orbital.Example-alkenes,alkyl free radicals etc.
In case of reverse hyperconjugation which occurs in alpha-haloalkenes,the delocalization of electrons occurs towards halogen group through hyperconjugative mechanism.Due to this reverse hyperconjugation the dipole moment of alpha-haloalkenes get augmented.

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