Benzene-1,4-dicarbonyl chloride

Benzene-1,4-dicarbonyl chloride is an organic compound with the molecular formula C8H4Cl2O2 and CAS number 100-20-9. This aromatic acid chloride features a benzene ring with two carbonyl chloride groups positioned at the 1,4 (para) positions. With a molecular weight of 203.02 g/mol, it serves as an important intermediate in organic synthesis and polymer chemistry.

Benzene-1,4-dicarbonyl chloride is typically a white to off-white crystalline solid at room temperature. It exhibits high reactivity due to its acid chloride functional groups, making it moisture-sensitive and prone to hydrolysis in humid conditions. The compound has limited solubility in water but dissolves readily in organic solvents such as dichloromethane, chloroform, and aromatic hydrocarbons.

Benzene-1,4-dicarbonyl chloride is primarily used as a key intermediate in polymer synthesis, particularly for producing high-performance polyamides, polyesters, and polyimides. It serves as a crucial building block in the manufacture of aramid fibers, engineering plastics, and specialty chemicals. Additionally, it finds applications in pharmaceutical synthesis and as a cross-linking agent in various industrial formulations.

Benzene-1,4-dicarbonyl chloride requires careful handling due to its corrosive nature and reactivity with moisture. Essential protective equipment includes chemical-resistant gloves, safety goggles, and appropriate respiratory protection. Work should be conducted in a well-ventilated area or under a fume hood. Avoid contact with skin, eyes, and clothing, and prevent exposure to moisture which can cause violent hydrolysis reactions.

Benzene-1,4-dicarbonyl chloride must be stored in a cool, dry environment away from moisture and humidity. Keep containers tightly sealed in their original packaging and store in a well-ventilated area away from heat sources and incompatible materials such as alcohols, amines, and water. The storage area should be equipped with appropriate containment measures and maintained at stable temperatures.

In case of skin contact with benzene-1,4-dicarbonyl chloride, immediately remove contaminated clothing and flush the affected area with plenty of water for at least 15 minutes. For eye contact, rinse thoroughly with water and seek immediate medical attention. If inhaled, move to fresh air and consult a physician. For ingestion, do not induce vomiting and seek emergency medical care immediately.

Benzene-1,4-dicarbonyl chloride disposal must comply with local and national hazardous waste regulations. The compound should never be discharged into drains or the environment. Waste material must be collected in appropriate containers and disposed of through licensed hazardous waste management companies. Small quantities can be carefully hydrolyzed under controlled conditions before neutralization and proper disposal.

Benzene-1,4-dicarbonyl chloride is classified under ADR Class 8 (Corrosive substances), Packing Group II, indicating its corrosive nature during transport. Proper packaging must meet UN specification requirements with appropriate labeling and documentation. Transportation should be conducted by qualified carriers familiar with hazardous materials regulations, ensuring compliance with international shipping standards and emergency response procedures.

Benzene-1,4-dicarbonyl chloride is subject to standard chemical regulations including REACH registration requirements in Europe and CLP classification for hazard communication. While not currently listed as an SVHC (Substance of Very High Concern), it must comply with workplace safety regulations and environmental protection standards. Users should maintain safety data sheets and follow applicable occupational exposure guidelines.

Benzene-1,4-dicarbonyl chloride is available through OYSI, a specialized European distributor of technical chemicals serving industrial customers across the continent. OYSI provides reliable supply chains for chemical intermediates and specialty compounds, ensuring proper packaging, documentation, and regulatory compliance for professional users in polymer manufacturing, pharmaceutical synthesis, and other industrial applications.