Overview
4-Fluoro-α-methylstyrene is a fluorinated aromatic compound with a reactive vinyl group, making it valuable in organic synthesis. It serves as a key intermediate in pharmaceuticals, agrochemicals, and specialty polymers. Its unique structure combines the reactivity of a styrene derivative with the electronic effects of a fluorine substituent, enabling tailored chemical modifications. The compound is typically supplied as a colorless to pale yellow liquid. Industrial production involves Friedel-Crafts alkylation or halogenation reactions. Due to its reactivity, it requires careful handling and storage to prevent polymerization or degradation.
Physical and Chemical Properties
4-Fluoro-α-methylstyrene has a molecular weight of 136.17 g/mol and a density of approximately 1.01 g/cm³. It boils at 170-172°C and is insoluble in water but miscible with common organic solvents like ethanol and acetone. The fluorine atom at the para position influences its electron distribution, enhancing its suitability for electrophilic aromatic substitution reactions. The compound's vinyl group is prone to polymerization under heat or light exposure. Stabilizers like hydroquinone are often added to inhibit premature polymerization during storage. Its flammability and moderate volatility necessitate airtight containers and flame-proof storage conditions.
Main Applications
In pharmaceuticals, 4-fluoro-α-methylstyrene is a precursor for fluorinated drug candidates, particularly those targeting CNS disorders. Its incorporation into molecules can improve metabolic stability and bioavailability. Agrochemical manufacturers use it to synthesize herbicides and pesticides with enhanced activity and selectivity. The compound also serves as a monomer for specialty polymers, including fluorinated polystyrene derivatives. These polymers exhibit improved thermal stability, chemical resistance, and optical properties, making them useful in coatings, electronics, and high-performance plastics.
Safety and Storage
As a flammable liquid, 4-fluoro-α-methylstyrene poses fire hazards and should be stored away from ignition sources. Use grounded containers and explosion-proof equipment. Skin or eye contact may cause irritation; wear nitrile gloves and goggles when handling. Adequate ventilation or respiratory protection is recommended to avoid inhalation of vapors. Storage conditions should be cool (below 25°C) and dark to prevent polymerization. Inhibited versions with stabilizers are preferred for long-term storage. In case of spills, absorb with inert materials like sand and dispose of as hazardous waste following local regulations.
B2B Procurement Guide
When procuring 4-fluoro-α-methylstyrene, prioritize suppliers with ISO or GMP certifications to ensure quality and traceability. Request certificates of analysis (CoA) verifying purity (typically ≥98%) and residual solvent levels. Bulk buyers should negotiate prices based on volume, with reference ranges of $50-$200/kg depending on purity and supplier. Consider logistics: the compound is often shipped in amber glass bottles or specialized plastic containers to prevent light degradation. Evaluate suppliers’ ability to provide stabilized products and their compliance with REACH or TSCA regulations if sourcing internationally.