CoachThe Cope rearrangement is the [3,3] sigmatropic rearrangement of a hexa-1,5-diene; the Claisen rearrangement that of an allyl vinyl ether, or of an allyl aryl ether, into a -unsaturated carbonyl compound or an ortho-allylphenol.
![Chair transition states of [3,3] sigmatropic rearrangements: two allyl fragments face each other; the 3–4 bond breaks (red) while the 1–6 bond forms (green). In the Claisen rearrangement atom 3 is the ether oxygen, and the product is a carbonyl compound. The chair fixes the relative configuration of new stereocentres.](/images/onecourse/chapters/chemistry-4/b3-pericyclic/fig-77404c7bd3e0.svg)
Chemistry · Glossary
What is Cope and Claisen rearrangements?
Also known as: Cope rearrangement · Claisen rearrangement