n-Butyllithium[2]
Overview
n-Butyllithium (n-BuLi) is an organometallic compound primarily used as a superbase and initiator in industrial chemistry. As a cornerstone of organolithium chemistry, it enables precise control in anionic polymerization and carbon-carbon bond formation. First synthesized in the 1930s, n-BuLi revolutionized synthetic methodologies. Its commercial solutions (typically 1.6M-2.5M in hexane) balance reactivity and handling safety, making it indispensable for pharmaceuticals, elastomers, and advanced materials production.
Physical and Chemical Properties
n-Butyllithium solutions are colorless to faint yellow, with concentration-dependent viscosity. The compound’s extreme air/moisture sensitivity necessitates strict exclusion techniques during use. Its pKa (~50) exceeds conventional bases, enabling deprotonation of weak acids. Thermally unstable above 0°C, n-BuLi decomposes into butane and lithium hydride. The hexane solvent lowers fire risks but requires proper ventilation due to flammability. Titration with diphenylacetic acid is standard for concentration verification.
Main Applications
In polymer production, n-BuLi initiates living anionic polymerization of styrene, butadiene, and isoprene, yielding precise molecular weights. It’s pivotal for SBS rubber and thermoplastic elastomers. Pharmaceutical synthesis employs n-BuLi for lithium-halogen exchange and directed metalation. Notable examples include antidepressant and antiviral drug intermediates. Specialty chemicals like liquid crystals also rely on its metallation efficiency.
Safety and Storage
n-BuLi demands OSHA-compliant handling: flame-resistant gear, face shields, and inert atmosphere glove boxes. Spills require dry chemical extinguishers—never water. Storage vessels must have pressure-relief caps and secondary containment. Decomposition products (butane gas) pose explosion hazards. Facilities need CO2/Halon-free fire suppression systems and dedicated quenching protocols using isopropanol/hexane mixtures.
B2B Procurement Guide
Industrial buyers should verify suppliers’ ISO 9001 certification and batch analysis reports. Key specifications include active Li content (<1% LiOH impurity) and peroxide levels. Bulk shipments (200kg drums) offer cost savings but require nitrogen-purged transfer systems. Just-in-time procurement minimizes storage risks. Contracts often include technical support for handling emergencies.
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