1,4-dichlorobut-2-ene

1,4-dichlorobut-2-ene is an organochlorine compound with the molecular formula C4H6Cl2 and CAS number 764-41-0. This chemical features a four-carbon chain with a double bond between carbons 2 and 3, and chlorine atoms attached to carbons 1 and 4. With a molecular weight of 124.99 g/mol, it is classified as a highly hazardous substance due to its carcinogenic properties and acute toxicity.

1,4-dichlorobut-2-ene is typically a colorless to pale yellow liquid at room temperature with a characteristic pungent odor. The compound has limited solubility in water but dissolves readily in organic solvents such as alcohols and ethers. Its double bond structure makes it reactive toward addition reactions, while the chlorine substituents contribute to its overall chemical instability and reactivity profile.

1,4-dichlorobut-2-ene serves primarily as a chemical intermediate in organic synthesis and pharmaceutical manufacturing. It is used in the production of specialized chemicals, research applications, and as a building block for more complex organic molecules. Due to its high toxicity and carcinogenic classification, its use is strictly limited to professional industrial applications with appropriate safety controls and regulatory compliance.

1,4-dichlorobut-2-ene requires extreme caution during handling due to its Carc. 1B and Acute Tox. 2-3 classifications. Essential protective equipment includes chemical-resistant gloves, full face protection, and appropriate respiratory protection. Work must be conducted in well-ventilated areas or under fume hoods. Avoid skin contact and inhalation completely, as the substance is both highly toxic and carcinogenic.

1,4-dichlorobut-2-ene must be stored in tightly sealed containers in a cool, dry, well-ventilated area away from heat sources and incompatible materials. Storage areas should be equipped with appropriate containment systems and restricted access due to the substance's carcinogenic nature. Keep away from oxidizing agents, strong bases, and sources of ignition. Regular inspection of containers is essential to prevent leaks.

Immediate action is critical following contact with 1,4-dichlorobut-2-ene due to its corrosive and toxic nature. For skin contact, immediately remove contaminated clothing and flush affected area with copious amounts of water for at least 15 minutes. In case of eye contact, rinse thoroughly with water. If inhaled, move to fresh air immediately. Seek immediate medical attention in all cases and provide safety data sheet information to medical personnel.

1,4-dichlorobut-2-ene disposal must comply with strict hazardous waste regulations due to its carcinogenic and toxic properties. The substance requires disposal through licensed hazardous waste contractors capable of handling toxic and carcinogenic materials. Incineration at high temperatures in approved facilities is typically the preferred method. Never dispose of through regular waste streams or sewage systems. Consult local environmental authorities for specific requirements.

1,4-dichlorobut-2-ene is classified under ADR Class 6.1 (toxic substances), Packing Group II, indicating high toxicity requiring special transport precautions. Transport must comply with dangerous goods regulations, using approved packaging and labeling with appropriate hazard pictogrammes (GHS06, GHS05, GHS08, GHS09). Drivers require specialized dangerous goods training, and transport documentation must include proper shipping names and emergency response information.

1,4-dichlorobut-2-ene is subject to extensive regulatory oversight under REACH, CLP, and national chemical safety regulations due to its Carc. 1B classification and high acute toxicity. Users must comply with worker protection regulations, environmental discharge limits, and potentially authorization requirements. The substance requires comprehensive risk assessments, exposure controls, and regulatory notifications. Regular monitoring and reporting may be mandatory depending on usage volumes and applications.

1,4-dichlorobut-2-ene is available through OYSI, a specialized European distributor of technical chemicals with expertise in hazardous substances. Due to the substance's high toxicity and carcinogenic classification, procurement requires demonstration of appropriate handling capabilities, regulatory compliance, and legitimate industrial use. OYSI provides comprehensive documentation, safety data sheets, and technical support to ensure safe and compliant handling throughout the supply chain.