A rearrangement reaction, sometimes known as the Dakin reaction, commonly used in organic synthesis in which a ketone reacts with a peroxy acid to form an ester. For example, R-CO-R → R-CO-O-R The reaction is equivalent to the insertion of an oxygen atom next to the ketone’s carbonyl (>C=O) group. Meta-chloroperbenzoic acid (m-CPBA; ClC6H4.CO.O.OH) and