HOOCRCOOH

HOOCRCOOH is a shorthand notation used in organic chemistry to denote hydroperoxycarboxylic acids, a family of peroxyacids with the general formula R-CO-O-O-H, where R is an organic substituent. In this representation the carboxyl-bearing carbon is attached to a peroxide linkage that ends in a hydroperoxy group. The exact identity of R determines the specific peracid.

Most commonly, R is an aryl or alkyl group. A well-known example is meta-chloroperoxybenzoic acid (mCPBA), where R is a substituted aryl ring. Peroxyacids of this class are widely used as oxidizing agents in organic synthesis, offering selective reactivity in several transformations.

Preparation and properties can vary with R, but peroxyacids of this type are typically crystalline or viscous liquids that are highly reactive and can be strong oxidizers. The O–O bond in the peroxide fragment is relatively weak, contributing to their reactivity and potential hazards. They are often prepared or handled in situ for safety and stability reasons, or used as commercially available reagents.

Applications include epoxidation of alkenes, Baeyer–Villiger oxidation of ketones to esters, and oxidation of sulfides to sulfoxides or sulfones. They can also serve in oxidative rearrangements and various oxidation protocols in organic synthesis.

Safety and handling are important: peroxyacids are potent oxidizers and some species can be shock-sensitive or explosive, especially when concentrated or impure. They should be stored cool, dry, and away from reducing agents, fuels, and heat, with appropriate protective equipment and procedures in place.

See also: peracids, peroxides, mCPBA, epoxidation, Baeyer–Villiger oxidation.