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(m-Chloroperoxybenzoic Acid)

Other Names:

m-Chloroperbenzoic acid

3-Chloroperoxybenzoic acid

3-Chloroperbenzoic acid

General Information:


CAS Number: 937-14-4

Molecular Weight: 172.57 g/mol

Appearance: White powder

Melting Point: 92-94 C

Acidity (pKa): 7.57

m-CPBA is a peroxycarboxylic acid that is commonly used as an oxidizing agent. It is usually available in <77% form because pure m-CPBA is shock sensitive (potentially explosive). It usually consists of ~10% m-chlorobenzoic acid and the remainder is H2O.

Common Uses:

Reagent for the oxidation of sulfides to sulfoxides

Reagent for the oxidation of sulfides to sulfones

Reagent for the oxidation of alkenes to epoxides

Reagent for Baeyer-Villiger oxidation

Reagent for the oxidation of nitrogen-containing compounds


Pure m-CPBA can be detonated by shock or sparks.


1) WO2016001341, page 101

2) WO2007084786, page 113

3) UK Pat App GB2463151A, page 179

4) Wikipedia: meta-Chloroperoxybenzoic acid (link)

5) 3-Chloroperbenzoic acid (link)

6) Burke, S. D.; Danheiser, R. L.; Handbook of Reagents for Organic Synthesis, Oxidizing and Reducing Agents