Ozonolysis of Alkenes

R2C=CR2 + O3 → R2C=O + R2C=O

Aperçu

Ozone cleaves carbon-carbon double bonds to form carbonyl compounds (aldehydes and/or ketones). The reaction proceeds through a molozonide intermediate that rearranges to an ozonide, which is then reduced. Ozonolysis is used to determine alkene double bond positions by identifying the carbonyl fragments.

Exemple du quotidien

Ozonolysis is used in forensic chemistry to determine the structure of unknown alkenes by analyzing the fragments produced.

Importance industrielle

Ozonolysis of oleic acid produces azelaic acid (for polymer synthesis) and pelargonic acid (herbicide). It is used in pharmaceutical synthesis.

Propriétés

Type
Organic
Réversible
Non
Énergie
Exothermique
ΔH
-300,0 kJ/mol
Catalyseur
Zn/AcOH or Me₂S (reductive workup)

Réactions associées

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 Ozonolysis of Alkenes?
The balanced equation is: R₂C=CR₂ + O₃ → R₂C=O + R₂C=O.
What type of reaction is Ozonolysis of Alkenes?
Ozonolysis of Alkenes is a organic reaction.
Is Ozonolysis of Alkenes exothermic or endothermic?
Ozonolysis of Alkenes is exothermic (releases energy). The enthalpy change (ΔH) is -300.0 kJ/mol.
What conditions are needed for Ozonolysis of Alkenes?
This reaction requires a catalyst (Zn/AcOH or Me₂S (reductive workup)).