Overview
Propargyl bromide is a versatile organobromine compound primarily used as a building block in organic synthesis. Its molecular structure combines a reactive alkyne group with a bromine atom, enabling diverse chemical transformations. Industrially, it is synthesized via the bromination of propargyl alcohol or similar precursors. The compound’s high reactivity makes it valuable for creating carbon-carbon bonds in pharmaceuticals and agrochemicals. However, its toxicity and flammability necessitate strict handling protocols. It is typically supplied in amber glass bottles or metal drums to prevent degradation.
Physical and Chemical Properties
Propargyl bromide is a volatile liquid with a pungent odor. Its density (1.52 g/cm³) and boiling point (88-90°C) reflect its molecular weight and polarizability. The bromine atom’s electronegativity enhances its reactivity in nucleophilic substitution reactions. Notably, the compound is insoluble in water but miscible with most organic solvents. Its flammability (flash point: 10°C) and toxicity require inert atmosphere storage. Propargyl bromide also reacts violently with oxidizing agents, necessitating isolation from peroxides and strong acids.
Main Applications
In pharmaceuticals, propargyl bromide serves as an intermediate for antitumor and antiviral agents. Its alkyne group participates in click chemistry, enabling precise molecular assembly. Agrochemical formulations use it to synthesize herbicides like propargite, which targets mites and fungi. The compound also aids in polymer crosslinking and corrosion inhibitors. Research laboratories employ it for organometallic catalysis and material science studies. Its niche applications include specialty dyes and flame retardants, though these are less common.
Safety and Storage
Propargyl bromide is classified as toxic (Category 3), corrosive, and flammable under GHS. Exposure causes severe eye/skin burns and respiratory irritation. Always use chemical-resistant gloves (e.g., nitrile) and splash goggles. Store in certified flammable storage cabinets with secondary containment. Transport requires UN-approved packaging and hazard labels (6.1+3). Spills should be neutralized with sodium thiosulfate and absorbed in inert material. Never dispose of it down drains; consult local regulations for hazardous waste disposal.
B2B Procurement Guide
When sourcing propargyl bromide, prioritize suppliers with ISO 9001 certification and SDS compliance. Request batch-specific COAs (Certificates of Analysis) to verify purity (≥98%) and impurity profiles. Bulk shipments (>100 kg) often require advance notice due to hazardous material logistics. Consider regional regulations: EU REACH and US TSCA listings may affect imports. Negotiate incoterms (e.g., EXW, CIF) based on transport risks. For R&D use, small-quantity vendors (e.g., Sigma-Aldrich, TCI) offer lab-grade options with faster lead times.
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