Electromeric effect:
The electromeric effect is a temporary effect, mainly experienced in the presence of an attacking reagent in the vicinity of an organic compound having multiple bonds(a double or triple bond). In this effect, the complete transfer of a shared pair of π-electrons to one of the atoms joined by multiple bonds on the demand of an attacking reagent takes place. The effect ceases as soon as the attacking reagent is removed from the domain of the reaction. The electromeric effect is mainly categorized into two categories.
1. Positive Electromeric Effect (+E effect):
The positive electromeric effect is defined as the transfer of π−electrons of the multiple bonds to the atom with which the reagent gets attached.
2. Negative Electromeric Effect (–E effect):
The positive electromeric effect is defined as the transfer of π−electrons of the multiple bonds to the atom with which the reagent does not get attached.
