2-(4-Carboxy-3-Fluorophenyl)benzoic Acid: Handling & Use Protocol

2-(4-Carboxy-3-fluorophenyl)benzoic acid is a bifunctional fluorinated aromatic diacid building block widely employed in organic synthesis, polymer chemistry, and medicinal chemistry research as a versatile intermediate.

Product Name

2-(4-Carboxy-3-fluorophenyl)benzoic acid

SKU

C180832

Functional Groups

Two carboxylic acid groups (-COOH) and one aromatic fluorine substituent

Typical Applications

Organic synthesis intermediate, polymer building block, medicinal chemistry scaffold

Recommended Storage

Store in a cool, dry place away from light and moisture; keep container tightly sealed

Solubility (General Guidance)

Soluble in polar organic solvents such as DMSO, DMF, and methanol; sparingly soluble in water at neutral pH; solubility improves under basic conditions

Materials and Safety Precautions

Before beginning work with 2-(4-Carboxy-3-fluorophenyl)benzoic acid (Aladdin SKU: C180832), gather the following materials and observe all relevant safety guidelines:

• Personal Protective Equipment (PPE): Lab coat, chemical-resistant gloves (nitrile recommended), and safety goggles must be worn at all times when handling this compound.
• Ventilation: All weighing and dissolution steps should be performed in a well-ventilated fume hood to minimize inhalation of fine particulate matter.
• Materials needed: Analytical balance, spatula, amber glass vials or screw-cap tubes, appropriate solvents (DMSO, DMF, or methanol for most applications), volumetric glassware, and pH indicator or pH meter if aqueous dissolution is attempted.
• Waste disposal: Collect all waste solutions and solid residues containing this compound in clearly labeled waste containers and dispose of according to your institution's chemical waste regulations.
• SDS consultation: Always consult the Safety Data Sheet (SDS) for C180832 before use. Contact Aladdin Scientific for the current SDS if not already available.

Note: Specific hazard classifications and GHS pictograms for C180832 should be confirmed from the official SDS. This protocol assumes standard handling precautions applicable to aromatic carboxylic acids as a general guideline.

Stock Solution Preparation

Follow the steps below to prepare a stock solution of 2-(4-Carboxy-3-fluorophenyl)benzoic acid for use in downstream experiments:

1. Equilibrate to room temperature: Allow the sealed vial of C180832 to equilibrate to room temperature before opening to prevent condensation of moisture onto the solid.
2. Weigh the compound: Tare a clean, dry weigh boat or vial on an analytical balance. Transfer the desired mass of 2-(4-Carboxy-3-fluorophenyl)benzoic acid using a clean spatula. Record the exact mass.
3. Select appropriate solvent: For most synthetic or biological screening applications, DMSO or DMF is recommended as the primary solvent to prepare a concentrated stock (e.g., 10–100 mM). If an aqueous solution is required, dissolve first in a minimal volume of DMSO and dilute into aqueous buffer, or adjust pH to alkaline conditions (pH 8–10) to improve water solubility.
4. Dissolve the compound: Add the weighed solid to the chosen solvent. Vortex or stir gently until fully dissolved. If dissolution is incomplete, gentle warming (40–50 °C) in a water bath may assist; do not heat above 60 °C.
5. Verify clarity: Inspect the solution visually. It should be clear and free of particulates. If turbidity persists, filter through a 0.22 µm PTFE syringe filter.
6. Label and store: Transfer the stock solution to a labelled amber vial. Record compound name, SKU (C180832), concentration, solvent, date of preparation, and preparer's initials. Store at –20 °C for long-term storage or at 4 °C for short-term use (up to one week).

Review flag: Exact solubility values (mg/mL) in specific solvents for C180832 are not confirmed in the source material and should be verified experimentally or from the product specification sheet.

Application in Organic Synthesis

2-(4-Carboxy-3-fluorophenyl)benzoic acid is a versatile bifunctional diacid intermediate. Its two carboxylic acid groups and aromatic fluorine substituent provide multiple handles for chemical transformation:

• Cyclization reactions: The proximity of the two carboxylate groups on the biphenyl scaffold makes this compound a candidate substrate for intramolecular cyclization to form cyclic anhydrides or lactone-containing ring systems under appropriate dehydrating conditions (e.g., acetic anhydride, or Dean–Stark conditions).
• Amide and ester bond formation: Either or both carboxylic acid groups can be activated (e.g., via formation of acid chlorides using thionyl chloride or oxalyl chloride, or via carbodiimide-mediated coupling such as EDC/NHS) to react with amines or alcohols to yield amide or ester products, useful for constructing polymer backbones or pharmaceutical intermediates.
• Nucleophilic aromatic substitution (SNAr): The aromatic fluorine, activated by adjacent electron-withdrawing groups, may participate in SNAr reactions with suitable nucleophiles (e.g., amines, thiols, alkoxides), enabling further functionalization of the aromatic ring.
• Metal-organic framework (MOF) linker: Fluorinated biphenyl dicarboxylic acids are used as linker molecules in the synthesis of porous MOF structures; the fluorine atom can tune pore properties and hydrophobicity.

When performing reactions with this compound, ensure that reaction conditions (solvent, temperature, base or acid) are optimized for the specific transformation. Consult primary literature for analogous fluorinated diacid substrates to guide condition selection.

Review flag: Specific reaction yields, temperatures, or literature precedents for C180832 itself are not available in the source material. All mechanistic claims above are based on general textbook-level organic chemistry principles for fluorinated aromatic diacids.

Quality Control and Analytical Verification

To confirm the identity and purity of your C180832 batch before use in critical experiments, consider the following analytical approaches:

• Melting point determination: Measure the melting point of a small sample using a capillary melting point apparatus. Compare the observed melting point against the value stated on the product certificate of analysis (CoA). Significant deviation may indicate degradation or contamination.
• Thin-layer chromatography (TLC): Spot the compound dissolved in a suitable solvent (e.g., EtOAc/hexane or MeOH/DCM) on a silica gel TLC plate. A single spot under UV light (254 nm) indicates high purity. Compare R_f value against literature analogs if available.
• NMR spectroscopy: Record ¹H and ¹⁹F NMR spectra in DMSO-d₆ or CDCl₃. Confirm the presence of aromatic proton signals consistent with the substituted biphenyl structure and a single ¹⁹F resonance consistent with an aryl fluoride. Broad –COOH proton signals may appear in ¹H NMR or may be absent depending on solvent and conditions.
• LC-MS or HPLC analysis: High-performance liquid chromatography (HPLC) with UV detection at 254 nm can confirm purity (>95% for standard research grade). Liquid chromatography–mass spectrometry (LC-MS) can verify the molecular ion consistent with the molecular formula of 2-(4-Carboxy-3-fluorophenyl)benzoic acid.
• Certificate of Analysis (CoA): Always request and review the CoA from Aladdin Scientific for lot-specific purity data, which should accompany each shipment of C180832.

Review flag: Specific melting point, NMR chemical shift values, and exact molecular weight for C180832 are not provided in the source material. These must be obtained from the product CoA or determined experimentally before publication.

Frequently asked questions

What solvents are recommended for dissolving 2-(4-Carboxy-3-fluorophenyl)benzoic acid?

DMSO and DMF are the most commonly recommended solvents for preparing concentrated stock solutions of fluorinated aromatic diacids such as this compound, due to their high polarity and ability to solvate carboxylic acid groups. Methanol is also suitable for many applications. For aqueous systems, dissolve first in a minimal volume of DMSO then dilute into buffer, or work at alkaline pH (8–10) to ionize the carboxylate groups and improve aqueous solubility.

How should C180832 be stored to maintain stability?

Store 2-(4-Carboxy-3-fluorophenyl)benzoic acid in a tightly sealed container in a cool, dry location away from direct light and moisture. For long-term storage of solid material, a refrigerator (2–8 °C) or freezer (–20 °C) is advisable. Prepared stock solutions in DMSO can typically be stored at –20 °C. Always allow the container to equilibrate to room temperature before opening to prevent moisture condensation.

Can 2-(4-Carboxy-3-fluorophenyl)benzoic acid undergo nucleophilic aromatic substitution at the fluorine position?

Yes, in principle the aromatic fluorine in this compound can participate in nucleophilic aromatic substitution (SNAr) reactions, particularly when the ring bearing the fluorine substituent also carries electron-withdrawing groups that activate the ipso carbon toward nucleophilic attack. This makes the compound a useful synthetic handle for introducing diverse functional groups via SNAr with amines, thiols, or alkoxides. Reaction efficiency will depend on the specific nucleophile, solvent, temperature, and base employed; conditions should be optimized experimentally.

How do I obtain the Safety Data Sheet (SDS) and Certificate of Analysis (CoA) for C180832?

The SDS and CoA for C180832 (2-(4-Carboxy-3-fluorophenyl)benzoic acid) can be requested directly from Aladdin Scientific through the product page on the Aladdin website or by contacting customer service. The CoA is lot-specific and should accompany each product shipment; if it was not included, please contact Aladdin Scientific support with your order number and lot number.

References

1. March, J. Advanced Organic Chemistry: Reactions, Mechanisms, and Structure. Wiley-Interscience. General reference for nucleophilic aromatic substitution and carboxylic acid reactivity.
2. Clayden, J.; Greeves, N.; Warren, S. Organic Chemistry, 2nd ed. Oxford University Press, 2012. General reference for aromatic fluorine chemistry and diacid synthesis.
3. Aladdin Scientific. Product Certificate of Analysis for C180832, 2-(4-Carboxy-3-fluorophenyl)benzoic acid. Aladdin Scientific, Shanghai.

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