Pericyclic reactions are the concerted reactions involving reorganization of electrons which occur by the way of a single cyclic transition state.

Characteristics of Pericyclic reactions:

* The pericyclic reactions occur in single step and hence there is no intermediate formed during the reaction.

* The breaking and making of bonds (both σ & π) occur simultaneously in a cyclic transition state.

* The configuration of the product depends on

1) the configuration of reactants

2) the number of electron pairs undergoing reorganization and

3) the reaction conditions (like thermal or photochemical).



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