orthocresol

Orthocresol, also known as o-cresol, is an aromatic organic compound that is one of the cresols—methylphenols with a hydroxyl group. Its chemical formula is C7H8O. The molecule consists of a benzene ring bearing a hydroxyl group and a methyl substituent at the ortho position relative to the hydroxyl.

It occurs in coal tar and is present in small amounts in wood creosote. Industrially, orthocresol is produced and refined as part of the cresol fraction obtained from coal-tar derivatives; it can also be formed during certain phenol methylation or chlorination processes and is separated by distillation and purification.

Orthocresol is used as an intermediate in the manufacture of dyes, fragrances, and some phenolic resins. It also finds use as a disinfectant or antiseptic in certain products, and has historically been a component of wood-preserving formulations. In addition, it serves as a solvent and as a precursor for other chemicals.

Orthocresol is a caustic, irritant compound that must be handled with appropriate protective equipment. Exposure can cause skin and eye irritation or burns; inhalation or ingestion can be hazardous. It is flammable and should be stored away from sources of ignition. Spills should be contained and disposed of according to applicable regulations. Environmental concerns include toxicity to aquatic life; spills should be cleaned up to minimize release.

Related compounds include the other cresols—m-cresol and p-cresol.