Electrocyclic Reaction Definition:
A pericyclic process in which a conjugated polyene undergoes cyclization.
Electrocyclic Reaction Explained:
A pericyclic rearrangement which is unimolecular, that become sigma bonded to one another that form shortened pi systems. In the process, one p bond is converted into a s bond, while the remaining p bonds all change their location. The newly formed s bond joins the ends of the original p system, thereby creating a ring.