What Is 3-Chloro-4-(trifluoromethyl)benzaldehyde and Why Is It Important?

3-Chloro-4-(trifluoromethyl)benzaldehyde (CAS 175278-22-5, Aladdin SKU C195216) is an aromatic aldehyde in which the benzene ring carries a chlorine atom at the 3-position and a trifluoromethyl (–CF3) group at the 4-position. The aldehyde carbonyl at the 1-position provides a highly reactive electrophilic site for a broad range of transformations including nucleophilic addition, reductive amination, Wittig olefination, and Schiff base condensation.

The simultaneous presence of –Cl and –CF3 substituents confers strong electron-withdrawing character on the ring, increasing the electrophilicity of the aldehyde carbonyl and tuning the lipophilicity and metabolic stability of downstream molecules. These properties make the compound a valued building block in the discovery and manufacture of fluorinated pharmaceuticals and crop-protection agents.

Physical and Chemical Properties

3-Chloro-4-(trifluoromethyl)benzaldehyde is typically encountered as a pale to colorless liquid or low-melting solid at room temperature. Key physical and chemical characteristics include:

• Molecular formula: C8H4ClF3O
• Molecular weight: 208.56 g/mol
• Substituent effects: The –CF3 group is among the most powerful electron-withdrawing groups in aromatic chemistry (Hammett σ_p ≈ +0.54), and the ortho –Cl further activates the ring toward nucleophilic aromatic substitution while simultaneously withdrawing electrons inductively.
• Reactivity: The activated aldehyde is susceptible to oxidation under ambient conditions; the compound should be handled under inert atmosphere where prolonged exposure to air is anticipated.
• Solubility: Soluble in common organic solvents such as dichloromethane, tetrahydrofuran, ethyl acetate, and dimethylformamide; limited solubility in water.

Researchers should consult the product's Certificate of Analysis (CoA) for lot-specific purity data and the Safety Data Sheet (SDS) for full physicochemical data.

Storage, Handling, and Safety Guidelines

Storage: Store in a tightly sealed container in a cool, dry, well-ventilated area away from heat sources, ignition sources, and incompatible materials such as strong oxidizers and strong bases. Refrigerated storage (2–8 °C) is commonly recommended to minimize oxidation and polymerization of the aldehyde functionality. Keep the container sealed under an inert gas blanket (nitrogen or argon) after opening.

Handling: Use appropriate personal protective equipment (PPE) including chemical-resistant gloves, safety goggles, and a laboratory coat. All operations should be carried out in a well-ventilated fume hood. The compound may be irritating to skin, eyes, and the respiratory tract. Avoid inhalation of vapors.

Disposal: Dispose of waste material in accordance with local, regional, and national regulations governing halogenated organic compounds. Do not discharge into drains or the environment.

Always consult the current SDS provided by Aladdin Scientific before use.

Synthetic Applications and Use Cases

The combination of an aldehyde handle with two electron-withdrawing aryl substituents makes 3-Chloro-4-(trifluoromethyl)benzaldehyde particularly useful across several synthetic contexts:

• Reductive amination: Reaction with primary or secondary amines in the presence of a reducing agent (e.g., NaBH3CN or NaBH(OAc)3) furnishes fluorinated benzylamines that are common pharmacophores.
• Knoevenagel and aldol condensations: The activated aldehyde undergoes Knoevenagel condensation with active methylene compounds to produce α,β-unsaturated derivatives useful as further synthetic intermediates.
• Schiff base formation: Condensation with primary amines yields imines (Schiff bases) employed as ligands in coordination chemistry or as precursors to heterocyclic scaffolds.
• Nucleophilic aromatic substitution (SNAr): The ortho-chloro group, activated by the para-CF3, can be displaced by nitrogen, oxygen, or sulfur nucleophiles under appropriate conditions to introduce additional diversity.
• Pharmaceutical and agrochemical discovery: Fluorinated aryl aldehydes of this type are routinely incorporated into fragment-based drug discovery libraries and high-throughput screening collections due to the favorable influence of fluorine on ADMET properties.

Ordering, Purity, and Quality Assurance

3-Chloro-4-(trifluoromethyl)benzaldehyde is available from Aladdin Scientific under SKU C195216. When ordering, consider the following:

• Purity grade: Confirm the required purity specification with your application in mind. Analytical-grade material is suitable for most research and synthetic applications. Consult the product page or contact Aladdin Scientific technical support for available purity grades and lot-specific CoA data.
• Quantity: The compound is typically offered in gram-to-hundred-gram quantities to support both exploratory and scale-up research needs.
• Documentation: A CoA and SDS are available for every lot. Request these documents at the time of order or download them from the Aladdin Scientific website using the lot number.
• Lead time: Standard catalog items are generally available for prompt dispatch; contact customer service for current stock availability and lead times for larger quantities.

For technical questions regarding suitability for specific applications, contact Aladdin Scientific's technical support team.