Chemical Identity and Physical Properties

4-(Trifluoromethyl)benzonitrile (CAS 455-18-5; SKU T109982) is a para-substituted benzonitrile carrying a strongly electron-withdrawing trifluoromethyl group at the 4-position. Its molecular formula is C₈H₄F₃N, giving a molecular weight of approximately 171.12 g/mol. The compound typically presents as a white to off-white crystalline solid at room temperature.

The combination of the –CF₃ group and the –CN group on the aromatic ring creates a highly electron-deficient π-system. This strong electron withdrawal lowers the LUMO energy, making the ring significantly activated toward nucleophilic aromatic substitution (SNAr) and other reactions with electron-rich partners. The –CF₃ group also imparts metabolic stability and lipophilicity adjustments prized in drug discovery programs.

Solubility: the compound is soluble in common polar aprotic organic solvents such as DMF, DMSO, acetonitrile, and dichloromethane. It has limited solubility in water. Store in a cool, dry, well-ventilated location away from moisture and incompatible materials.

Synthetic Applications and Research Uses

4-(Trifluoromethyl)benzonitrile serves as a versatile bifunctional building block in organic synthesis. The two principal transformations exploited by chemists are:

• Nitrile group transformations: The –CN group can be hydrolyzed to the corresponding carboxylic acid or amide, reduced to a primary amine, converted to a tetrazole via [3+2] cycloaddition with azides, or engaged in nucleophilic addition to give imine and amine derivatives. These transformations are foundational in generating diverse pharmaceutical scaffolds.
• Nucleophilic aromatic substitution (SNAr): The electron-deficient ring undergoes SNAr reactions with amines, alkoxides, and thiolates. This reactivity is leveraged in the synthesis of biaryls, heterocycles, and pharmacologically active molecules bearing the 4-(trifluoromethyl)phenyl motif.

In medicinal chemistry, the 4-(trifluoromethyl)phenyl and 4-(trifluoromethyl)benzonitrile motifs appear frequently in kinase inhibitors, GPCR ligands, and agrochemical active ingredients, owing to the beneficial effects of fluorine on bioavailability and binding affinity. The compound is also used in the synthesis of fluorinated liquid crystals and specialty polymers in materials science research.

Safety, Handling and Storage Guidelines

Researchers should consult the current Safety Data Sheet (SDS) supplied by Aladdin Scientific before using 4-(Trifluoromethyl)benzonitrile. General precautions applicable to aromatic nitrile compounds include:

• Personal Protective Equipment (PPE): Wear appropriate chemical-resistant gloves (e.g., nitrile gloves), safety goggles, and a laboratory coat. Work in a fume hood to avoid inhalation of dust or vapors.
• Inhalation and skin/eye contact: Avoid breathing dust or vapor. In case of skin or eye contact, flush thoroughly with water and seek medical advice. The nitrile functional group warrants caution; although benzonitriles are generally of lower acute toxicity than aliphatic nitriles, prudent handling is required.
• Storage: Store in a tightly sealed container in a cool (recommended 2–8 °C or as specified on the label), dry, well-ventilated area away from oxidizing agents, strong bases, and reducing agents. Protect from moisture to prevent slow hydrolysis of the nitrile group.
• Disposal: Dispose of waste material in accordance with local environmental regulations governing fluorinated organic compounds.

Always verify specific hazard classifications, GHS pictograms, and first-aid measures in the Aladdin SDS for T109982 prior to use.

Quality, Purity and Specification Considerations

For research applications, the purity of 4-(Trifluoromethyl)benzonitrile is critical, particularly when the compound is used as a reference standard or as a key intermediate in multi-step synthesis. Consider the following when specifying or procuring this reagent:

• Analytical purity: Aladdin Scientific offers T109982 with purity specifications suitable for synthetic research. Confirm purity grade (e.g., ≥97% or ≥98% by GC or HPLC) on the current product page or Certificate of Analysis (CoA) prior to ordering, as specifications may be updated.
• Identity confirmation: Routine analytical methods for identity verification include ¹H NMR, ¹³C NMR, ¹⁹F NMR, and GC-MS. The characteristic ¹⁹F NMR signal of the –CF₃ group and the IR absorption of the –CN stretch (~2230 cm^-1) are diagnostic.
• Moisture sensitivity: Although not classified as highly moisture-sensitive, prolonged exposure to humid conditions may lead to partial nitrile hydrolysis over time. Receive and store the product in sealed packaging and open under inert atmosphere conditions for moisture-sensitive applications.
• Lot-to-lot consistency: Request a Certificate of Analysis for each lot. For regulatory or GMP-adjacent workflows, contact Aladdin Scientific customer support to discuss documentation requirements.