Cope Rearrangement Definition:

A [3,3] sigmatropic rearrangement in which all six atoms of the cyclic transition state are carbon atoms.

Cope Rearrangement Explained:

It is an extensively studied organic reaction involving [3,3] sigmatropic rearrangement of 1,5 dienes, it was developed by an organic chemist named Arthur C. Cope. The rearrangement might be concerted or pericyclic in nature, however, it can also be considered via the transitional state. The method is mostly used in organic synthesis, where it results in an energetically and structurally stable compound.