Saturday 15 November 2014

Mesomeric effect

Mesomeric effect

 For happening a successful reaction there need a successful attack by reagent to the substrate. Reaction is nothing but a simple thing that one bond will break down and other new bond will form and finally as a resut with new products. To happen this an attack is important by reagent. In what region of substrate the reagent will do attack is a considerable subject.  Where reagent will attack to the substrate is depend on three factors. These are inductive effect, mesomeric effect and electromeric effect. All of three factors are involved in distribution of electron cloud in bond beteen the atoms. Though every effect is just same with the main function, yet these are different in unique parameter.

The difference of inductive effect from mesomeric effect is that in inductive effect the unequal distribution of electron cloud happens in sigma bond and in mesomeric effect the unequal distribution of electron cloud happens in pi bond.


omeric effect involve in the pi bond of the molecule. It involve in interaction between two pi electron or pi electron with lone pair electron. In conjugated double bond compound the mesomeric effect is noticeable. In this case the displacement and shifting of electron happened and form a resonance structure. Just like inductive effect the mesomeric effect transmited through one steps to another step. The group attract electron to itself is have +M effect and that have releasing tendency that have +-M effect

 Cause of mesomeric effect

 Mesomeric effect is the results of the difference of the electronegativity. Two ato

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