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 exposure considerations.
Chemical identity is more than a name. Closely related salts, isomers, hydrates, metabolites, intermediates, and final products can have different registry numbers and different physical or biological behavior. For a chemical database, keeping those forms separate prevents a property measured for one substance from being silently assigned to another.
Synthesis also depends on chemoselectivity. A useful intermediate contains functional groups that can be transformed in a predictable order, allowing chemists to build complexity while protecting parts of the molecule that must remain unchanged. This is why apparently modest building blocks can be important in medicinal, materials, or process chemistry even when they never appear in a finished product.
Analytical control is the other half of synthesis. Identity, purity, water or salt content, stereochemistry, and process-related impurities may all matter to reproducibility. Reference standards and well-characterized intermediates therefore have value beyond their immediate reaction step: they allow laboratories to confirm that a route is producing the intended chemical entity.
A responsible Chemical Story separates documented application from structural possibility. Familiar motifs can suggest hypotheses, but structural resemblance alone does not prove pharmacological activity, industrial adoption, or regulatory status. Where exact-CAS literature is sparse, the scientifically useful approach is to describe verified chemistry and stop before speculation becomes a claimed fact.
Chemical identity is more than a name. Closely related salts, isomers, hydrates, metabolites, intermediates, and final products can have different registry numbers and different physical or biological behavior. For a chemical database, keeping those forms separate prevents a property measured for one substance from being silently assigned to another.
Synthesis also depends on chemoselectivity. A useful intermediate contains functional groups that can be transformed in a predictable order, allowing chemists to build complexity while protecting parts of the molecule that must remain unchanged. This is why apparently modest building blocks can be important in medicinal, materials, or process chemistry even when they never appear in a finished product.
Analytical control is the other half of synthesis. Identity, purity, water or salt content, stereochemistry, and process-related impurities may all matter to reproducibility. Reference standards and well-characterized intermediates therefore have value beyond their immediate reaction step: they allow laboratories to confirm that a route is producing the intended chemical entity.
A responsible Chemical Story separates documented application from structural possibility. Familiar motifs can suggest hypotheses, but structural resemblance alone does not prove pharmacological activity, industrial adoption, or regulatory status. Where exact-CAS literature is sparse, the scientifically useful approach is to describe verified chemistry and stop before speculation becomes a claimed fact.
References:
1. U.S. EPA. 1,4-Dichlorobenzene Hazard Summary.
2. U.S. EPA. Occurrence Summary and Use Support Document for 1,4-Dichlorobenzene.
3. ATSDR. Toxicological Profile for Dichlorobenzenes.
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