134dichlorobenzene

1,4-Dichlorobenzene, also known as p-dichlorobenzene or PDCs, is an organochlorine compound with the chemical formula C6H4Cl2. It is a white crystalline solid with a strong, penetrating odor. This compound is a positional isomer of dichlorobenzene, with the two chlorine atoms located at opposite positions on the benzene ring. It is synthesized industrially through the chlorination of benzene. 1,4-Dichlorobenzene is sparingly soluble in water but readily soluble in many organic solvents such as ethanol and ether.

Historically, 1,4-dichlorobenzene has been widely used as a fumigant, particularly as a moth repellent in closets and as a deodorant in toilet bowls. Its effectiveness stems from its ability to sublimate, meaning it can transition directly from a solid to a gas phase at room temperature, releasing vapors that kill or repel insects and mask odors. Due to environmental and health concerns, its use in these applications has been restricted or phased out in many regions. It is also used as an intermediate in the synthesis of other chemicals, including certain dyes and polymers. While its direct consumer applications have declined, its industrial uses persist.

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