Overview
1,4-Cyclohexadiene is a cyclic diene with the formula C6H8, structurally featuring two double bonds at the 1 and 4 positions. It is a valuable intermediate in organic chemistry, particularly for Diels-Alder reactions, where it acts as a diene component. The compound is commercially available but requires careful handling due to its flammability and reactivity. Primarily used in research and industrial settings, 1,4-cyclohexadiene is synthesized through partial hydrogenation of benzene or dehydrogenation of cyclohexane derivatives. Its role in synthesizing complex organic molecules makes it a staple in pharmaceutical and materials science laboratories.
Physical and Chemical Properties
As a low-viscosity liquid, 1,4-cyclohexadiene has a density of 0.847 g/cm³ and boils at 85–86°C. Its insolubility in water but solubility in common organic solvents like ethanol and ether makes it suitable for reactions in non-aqueous media. The compound’s double bonds confer reactivity, especially in cycloaddition and polymerization reactions. Key chemical properties include its ability to participate in Diels-Alder reactions, forming six-membered rings with dienophiles. It is sensitive to air and light, often requiring storage under inert atmospheres to prevent degradation or unwanted polymerization. Its flammability (flash point: -6°C) necessitates strict safety protocols during handling.
Main Applications
1,4-Cyclohexadiene is predominantly used in organic synthesis, serving as a building block for pharmaceuticals, agrochemicals, and specialty polymers. In drug development, it aids in constructing cyclic frameworks via Diels-Alder reactions. For instance, it is employed in synthesizing steroid analogs and other bioactive molecules. Industrial applications include its use as a hydrogen donor in transfer hydrogenation reactions. Additionally, it finds niche roles in materials science for modifying polymer backbones or creating conductive organic materials. Research laboratories value it for its versatility in constructing complex molecular architectures.
Safety and Storage
Due to its high flammability and reactivity, 1,4-cyclohexadiene requires storage in tightly sealed containers under nitrogen or argon, away from heat and ignition sources. Laboratories should use explosion-proof refrigerators for long-term storage. PPE such as gloves, goggles, and flame-resistant lab coats is mandatory during handling. Exposure risks include inhalation of vapors and skin contact, which may cause irritation. Work should be conducted in fume hoods with proper ventilation. Spills must be neutralized with inert absorbents and disposed of as hazardous waste. Regulatory guidelines (e.g., OSHA, GHS) classify it as a Category 2 flammable liquid.
B2B Procurement Guide
When procuring 1,4-cyclohexadiene, prioritize suppliers with ISO certification and batch-specific COAs (Certificates of Analysis) confirming purity (≥98%). Common packaging includes amber glass bottles or metal drums under nitrogen to enhance stability. Bulk purchases (25 kg drums) may reduce costs but require validated storage facilities. Key selection criteria include testing for peroxides (common degradation products) and verifying absence of stabilizers if intended for sensitive reactions. Lead times can vary; specialty grades may require 2–4 weeks for production. Establish MOQs (Minimum Order Quantities) and negotiate pricing tiers for recurring orders.
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