Overview
Phenylacetylene (C8H6) is a terminal alkyne featuring a benzene ring attached to an acetylene group. It serves as a versatile intermediate in organic synthesis due to its reactive triple bond. The compound is commercially significant in pharmaceuticals, agrochemicals, and specialty polymers. First synthesized in the late 19th century, phenylacetylene is now produced via dehydrohalogenation of styrene derivatives or Sonogashira coupling. Its stability and reactivity make it a preferred choice for cross-coupling reactions, such as the synthesis of substituted alkynes or heterocycles.
Physical and Chemical Properties
Phenylacetylene is a colorless to pale yellow liquid with a distinctive odor. It has a low melting point (-45°C) and boils at 142-144°C, with a density of 0.93 g/cm³. The compound is soluble in common organic solvents like ethanol and ether but immiscible with water. Chemically, the terminal alkyne group is highly reactive, participating in addition, polymerization, and metal-catalyzed coupling reactions. Phenylacetylene is sensitive to air and light, which can lead to polymerization or oxidation. Its flammability (flash point: 31°C) necessitates careful handling.
Main Applications
In pharmaceuticals, phenylacetylene is a key intermediate for antitumor agents, HIV protease inhibitors, and antifungal drugs. Its role in Suzuki-Miyaura and Heck couplings enables the construction of complex molecular architectures. The agrochemical industry uses it to synthesize pesticides and herbicides. Additionally, phenylacetylene derivatives are employed in OLED materials and conductive polymers due to their electron-conducting properties. Research labs utilize it for metal-organic frameworks (MOFs) and click chemistry.
Safety and Storage
Phenylacetylene is flammable and reacts violently with oxidizers. Storage requires inert atmospheres (e.g., nitrogen) and fireproof cabinets. Use explosion-proof equipment and avoid contact with skin/eyes; PPE like gloves and goggles is mandatory. Dispose of waste via licensed hazardous waste handlers. Spills should be contained with inert absorbents (sand, vermiculite) and reported per local regulations. Always refer to SDS for emergency measures.
B2B Procurement Guide
Procure phenylacetylene from reputable suppliers with ISO 9001 or cGMP certifications. Key specifications include purity (>98%), water content (<0.5%), and absence of heavy metals. Bulk orders (100+ kg) often reduce costs by 20-30%. Logistics should prioritize temperature-controlled transport to prevent degradation. Negotiate contracts with clauses for batch testing and regulatory compliance (REACH, FDA). For pharmaceutical use, demand full analytical certificates (CoA) and stability data.
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