Cope Rearrangement

1,5-hexadiene ⇌ 1,5-hexadiene (rearranged)

Übersicht

The Cope rearrangement is a [3,3]-sigmatropic rearrangement of 1,5-dienes that proceeds through a chair-like transition state. No bonds are broken or formed to reagents; the sigma bond migrates through the diene framework. The oxy-Cope variant (followed by keto-enol tautomerism) is particularly useful in synthesis.

Alltägliches Beispiel

The Cope rearrangement demonstrates that molecules can rearrange thermally without any catalyst or reagent, just by heating.

Industrielle Bedeutung

Sigmatropic rearrangements like the Cope are used in natural product synthesis and in understanding thermal stability of organic materials.

Eigenschaften

Typ
Organic
Reversibel
Ja
Energie
Endotherm
ΔH
0,0 kJ/mol
Katalysator
Heat (200-300 C)

Verwandte Reaktionen

Epoxidation of Alkenes (mCPBA) Swern Oxidation Oxidation of Secondary Alcohol to Ketone E2 Elimination (Dehydrohalogenation) Claisen Condensation (Ethyl Acetate) Aldol Condensation of Acetaldehyde Kolbe Electrolysis Baeyer-Villiger Oxidation Beckmann Rearrangement (Cyclohexanone Oxime) Dehydration of Ethanol

Frequently Asked Questions

What is the equation for Cope Rearrangement?
The balanced equation is: 1,5-hexadiene ⇌ 1,5-hexadiene (rearranged).
What type of reaction is Cope Rearrangement?
Cope Rearrangement is a organic reaction. It is reversible under certain conditions.
Is Cope Rearrangement exothermic or endothermic?
Cope Rearrangement is endothermic (absorbs energy). The enthalpy change (ΔH) is 0.0 kJ/mol.
What conditions are needed for Cope Rearrangement?
This reaction requires a catalyst (Heat (200-300 C)).