dichlorophenols

Dichlorophenols are aromatic compounds in which two chlorine atoms replace hydrogen atoms on the benzene ring of phenol. There are six positional isomers: 2,3-, 2,4-, 2,5-, 2,6-, 3,4-, and 3,5-dichlorophenol. They are typically colorless to pale yellow solids or liquids at room temperature and have the characteristic phenolic odor.

Industrially, they are produced by chlorinating phenol under controlled conditions or by chlorinating other chlorinated precursors. They serve as intermediates in the manufacture of dyes, disinfectants, resins, and as precursors to herbicides based on dichlorophenoxyacetic acids, as well as other pesticides and wood preservatives.

Environmental releases occur from manufacturing and consumer products. Dichlorophenols can be toxic to aquatic life and may irritate skin and eyes; some isomers pose risks to human health with prolonged exposure. They can contribute to the formation of more persistent chlorinated compounds during combustion or wastewater treatment, and are subject to regulatory control in many jurisdictions.

Handling requires appropriate protective equipment and procedures due to corrosivity and potential toxicity. They should be stored away from heat and oxidizers, and spills should be contained to prevent environmental release.