1,4-Dichlorobenzene

CAS 106-46-7

1,4-Dichlorobenzene (CAS 106-46-7) shows how molecular structure determines chemical role. 1,4-Dichlorobenzene (CAS 106-46-7), commonly called para-dichlorobenzene or p-DCB, is the para isomer of dichlorobenzene: two chlorine atoms occupy opposite positions on a benzene ring. At room temperature it is a crystalline solid that readily sublimes, passing directly into vapor. That physical behavior explains its historically familiar odor and its use in moth-control and deodorant products, where the vapor rather than a liquid spray performs the function. EPA documents also describe its use as a chemical intermediate, including manufacture of other chemicals and resins. The same volatility that made p-DCB commercially useful also makes inhalation the principal route of general-population exposure from consumer products. Modern discussion of the compound therefore combines simple aromatic chemistry with environmental and.