Overview
4-Fluorobenzyl chloride is an organofluorine compound with the formula C7H6ClF. It is a key intermediate in the synthesis of pharmaceuticals, agrochemicals, and specialty chemicals. The compound features a reactive chloromethyl group attached to a fluorinated benzene ring, making it versatile for nucleophilic substitution reactions. Industrially, it is produced via chlorination of 4-fluorotoluene under controlled conditions. Its demand is driven by its role in producing active pharmaceutical ingredients (APIs) and crop protection agents.
Physical and Chemical Properties
4-Fluorobenzyl chloride is a colorless to pale yellow liquid with a pungent odor. It has a density of approximately 1.19 g/cm³ and boils at 180–182°C. The compound is hydrophobic but readily dissolves in organic solvents like ethanol, acetone, and ether. Chemically, it is highly reactive due to the labile chlorine atom, which undergoes nucleophilic displacement with amines, alcohols, and other nucleophiles. It hydrolyzes in water, releasing hydrochloric acid, and must be stored under anhydrous conditions to prevent degradation.
Main Applications
The primary use of 4-fluorobenzyl chloride is as a building block in pharmaceutical synthesis. It is employed in the production of antidepressants, antihistamines, and antifungal agents. For example, it serves as a precursor to 4-fluorobenzylamine, a moiety in certain CNS-active drugs. In agrochemicals, it is used to synthesize herbicides and pesticides. Additionally, it finds niche applications in dyes, fragrances, and polymer crosslinking agents due to its aromatic fluorine substituent.
Safety and Storage
4-Fluorobenzyl chloride is corrosive and toxic upon inhalation, ingestion, or skin contact. Proper PPE—including chemical-resistant gloves, goggles, and lab coats—must be worn. Work should be conducted in a fume hood to avoid vapor exposure. Store in tightly sealed containers under inert gas (e.g., nitrogen) to prevent moisture ingress. Incompatible with strong oxidizers and bases. Spills should be neutralized with sodium bicarbonate and absorbed in inert material.
B2B Procurement Guide
When procuring 4-fluorobenzyl chloride, prioritize suppliers with ISO or GMP certifications to ensure quality. Key specifications include purity (≥98%), water content (<0.5%), and absence of heavy metals. Bulk orders (drum quantities) typically offer cost savings. Logistics require corrosion-resistant packaging (e.g., glass or fluorinated polyethylene bottles) and hazardous material documentation (SDS, transport classifications). Sample testing for reactivity and impurity profiling is advised before large-scale purchases.
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