Write a short note on hyperconjugation/what is hyperconjugation or non-bonded resonance? The phenomenon of hyperconjugation can be considered in terms of resonance as well as molecular orbital theory. The alpha(A)-C—H bond, when present in conjugation with the conjugation system, participates in deprotonation. This unexpected behaviour of the C—H sigma bond is called hyperconjugation. This blog is written by one of my students Ritika Rathore, a B.Sc first-year student. Thanks, Ritika
Write a short note on hyperconjugation/what is hyperconjugation or non-bonded resonance?
In the representation of the pi bond with alpha, the C—H sigma bond forms “NO BOND” b/w C and H. Hence this type of resonance is also called “no bond resonance”.
Since hyperconjugation depends on the presence of a hydrogen atom attached to the alpha carbon, the election release due to hyperconjugation should occur in the following order as opposed to the order of inductive effect hyperconjugation.
more powerful than the inductive effect.
CH3> -CH3 – CH2 >- CH (CH3)2 > -C(CH3)3
Like resonance, hyperconjugation also affects various physical properties of a compound.
For example, the shortening of the C–C single bond adjacent to the triple bond is due to the contribution of the ionic form to the hybrid as well.
It also explains the stability order of carbonium ions.
Tertiary > Secondary > Primary > CH3
Effects of Hyperconjugation:
Hyperconjugation can affect both physical and chemical properties of molecules. , the hyperconjugation can be thought of as a second-order resonance.
