2-Fluorotoluene

Updated: 2026-07-15

Overview

2-Fluorotoluene, also known as o-fluorotoluene, is a fluorinated aromatic hydrocarbon primarily used as a building block in organic synthesis. It belongs to the class of fluorotoluenes, where a fluorine atom is substituted at the ortho position of the toluene ring. Its unique electronic properties make it valuable for introducing fluorine into complex molecules, particularly in pharmaceutical and agrochemical manufacturing. The compound is produced through halogen-exchange reactions or direct fluorination of toluene derivatives. Industrial-grade 2-fluorotoluene typically has a purity of ≥98% and is supplied in drums or IBC containers for large-scale applications. Its reactivity profile allows for selective transformations in nucleophilic aromatic substitution and cross-coupling reactions.

Physical and Chemical Properties

2-Fluorotoluene is a volatile, colorless liquid with a characteristic aromatic odor. It has a relatively low boiling point (114-115°C), which facilitates its use as a solvent in certain reactions. The fluorine atom's strong electron-withdrawing effect influences the compound's reactivity, making the methyl group more susceptible to oxidation compared to toluene. The compound's density (1.002 g/cm³) is slightly higher than water, and it exhibits limited water solubility due to its hydrophobic nature. Its vapor pressure at 20°C is approximately 20 hPa, requiring careful handling to prevent inhalation exposure. The fluorine substitution also affects the compound's NMR spectrum, with distinctive coupling patterns between the fluorine and aromatic protons.

Main Applications

In the pharmaceutical industry, 2-fluorotoluene serves as a key intermediate for synthesizing fluorinated active pharmaceutical ingredients (APIs). The fluorine atom often enhances metabolic stability and bioavailability of drug molecules. It's particularly valuable in creating CNS-targeting compounds and anti-inflammatory agents. The agrochemical sector utilizes this compound in manufacturing fluorinated pesticides and herbicides, where the fluorine atom improves compound efficacy and environmental persistence. Additionally, 2-fluorotoluene finds use in specialty chemicals, including liquid crystals for displays and fluorinated polymers with unique thermal and chemical resistance properties.

Safety and Storage

As a flammable liquid (Flash point: 12°C), 2-fluorotoluene requires storage in approved flammable liquid cabinets away from heat sources and oxidizing agents. Containers should be grounded during transfer to prevent static discharge. The compound's vapor may form explosive mixtures with air at concentrations of 1.1-8.7% by volume. Personal protective equipment (PPE) including chemical-resistant gloves (nitrile or neoprene), safety goggles, and proper ventilation are mandatory when handling. In case of spills, absorb with inert material and dispose as hazardous waste. Long-term storage should be in stainless steel or fluoropolymer-lined containers to prevent degradation.

B2B Procurement Guide

When procuring 2-fluorotoluene, buyers should specify required purity (typically 98-99.5%), moisture content (<0.1%), and impurity profiles. Pharmaceutical-grade material requires additional certificates of analysis and may command premium pricing. Bulk shipments (drum quantities or larger) typically offer better per-unit costs but require appropriate hazardous material handling infrastructure. Reliable suppliers should provide SDS documentation and comply with regional chemical regulations (REACH, TSCA, etc.). For international shipments, verify proper hazardous material classification (UN 1993) and transportation requirements. Some manufacturers offer custom synthesis services for derivatives or isotopically labeled versions of 2-fluorotoluene for research applications.