Overview
3'-Bromophenylacetylene is a brominated aromatic alkyne that serves as a versatile building block in organic synthesis. Its molecular structure combines a benzene ring with both a bromo substituent and an ethynyl group, making it particularly valuable for cross-coupling reactions. This compound is classified as a high-value fine chemical, primarily used by research institutions and specialty chemical manufacturers. The presence of both reactive sites (bromo and alkyne) allows for sequential functionalization, enabling the construction of complex molecular architectures.
Physical and Chemical Properties
As a liquid at room temperature, 3'-Bromophenylacetylene exhibits moderate volatility with a characteristic aromatic odor. Its density of approximately 1.45 g/cm³ indicates it is heavier than water. The compound's boiling point around 190-192°C makes it suitable for various reaction conditions without excessive decomposition. The bromine atom activates the aromatic ring toward electrophilic substitution, while the terminal alkyne group readily participates in metal-catalyzed coupling reactions. This dual reactivity profile is central to its synthetic utility. The compound shows good stability when stored properly but may polymerize or decompose when exposed to strong acids, bases, or oxidizing agents.
Main Applications
In pharmaceutical chemistry, 3'-Bromophenylacetylene serves as a key intermediate for creating active pharmaceutical ingredients (APIs), particularly those containing biphenyl or extended π-conjugated systems. Its use in Sonogashira coupling reactions enables the formation of carbon-carbon bonds between aromatic rings and acetylene units. The agrochemical industry employs this compound in synthesizing novel pesticides and herbicides with enhanced activity profiles. Additionally, material scientists utilize it for creating organic semiconductors and conductive polymers, where the bromophenylacetylene moiety helps tune electronic properties and molecular packing in the solid state.
Safety and Storage
Proper handling of 3'-Bromophenylacetylene requires strict adherence to safety protocols due to its flammability and irritant properties. Work should be conducted in a fume hood with appropriate personal protective equipment including nitrile gloves, safety goggles, and flame-resistant lab coats. Storage recommendations include keeping the chemical in amber glass bottles under nitrogen atmosphere at temperatures between 2-8°C for long-term preservation. Containers should be clearly labeled with hazard pictograms (flammable liquid, irritant) and stored separately from strong oxidizers. Spill containment kits with inert absorbents should be readily available in storage and work areas.
B2B Procurement Guide
When sourcing 3'-Bromophenylacetylene for industrial applications, buyers should prioritize suppliers with proven track records in handling sensitive organobromine compounds. Key procurement considerations include batch-to-batch consistency, impurity profiles (particularly free bromine content), and packaging options that ensure product integrity during transit. Technical specifications should include NMR and HPLC purity data, residual solvent analysis, and moisture content. For large-scale purchases, request samples for qualification testing before committing to bulk orders. Establish clear agreements regarding lead times, minimum order quantities (MOQs), and technical support for scale-up processes.
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