Summary of Key Buying and Handling Points

• CAS 139301-27-2 identifies 4-trifluoromethoxyphenylboronic acid, an aryl boronic acid building block.
• Its commonly reported molecular formula is C₇H₆BF₃O₃, with a molecular weight of approximately 205.93 g/mol.
• Its main synthetic role is carbon–carbon bond formation through Suzuki–Miyaura coupling with suitable aryl or heteroaryl halides.
• Because boronic acids may be sensitive to moisture, heat, and prolonged storage, I advise using the supplier’s SDS and COA to define the final storage and release conditions.
• Before purchasing, confirm assay, analytical method, particle or physical form, packaging size, MOQ, lead time, and export documentation.

Who This Guide Is For

This guide is intended for procurement teams, process chemists, medicinal chemists, formulation researchers, and distributors sourcing 4-trifluoromethoxyphenylboronic acid for laboratory or development work. It is also useful for buyers comparing several aryl boronic acid suppliers and trying to reduce avoidable risks during scale-up. I focus on practical selection, coupling use, storage, documentation, and supplier communication. The information is general and should be checked against the current product specification and safety documentation for each batch.

What Is 4-Trifluoromethoxyphenylboronic Acid?

4-Trifluoromethoxyphenylboronic acid is an aromatic boronic acid containing a phenyl ring substituted with a trifluoromethoxy group and a boronic acid group in the para position. The boronic acid functionality is the principal reactive handle used in cross-coupling chemistry. The trifluoromethoxy group can influence lipophilicity, electronic properties, and metabolic behavior in research compounds, although the actual effect depends on the complete molecular structure and assay system.

The compound is generally treated as a fine-chemical intermediate rather than as a finished pharmaceutical ingredient. Its physical appearance, purity, residual solvents, water content, and stability profile can vary with manufacturing and packaging conditions. For this reason, I do not recommend relying only on a website description; buyers should request a current COA and, where needed, supporting analytical data such as HPLC, NMR, LC-MS, or Karl Fischer results.

Key Identification and Specification Items

Uses in Organic and Pharmaceutical Research

The most established use is as an aryl donor in Suzuki–Miyaura coupling. In a typical reaction concept, the boronic acid reacts with an aryl, heteroaryl, or vinyl halide in the presence of a compatible palladium catalyst, base, solvent system, and controlled reaction conditions. The result is a new carbon–carbon bond, while the boronic acid group is removed during the coupling sequence.

Researchers may use this intermediate to prepare fluorinated biaryl or heteroaryl compounds for screening libraries, lead optimization, process development, and materials research. The para-trifluoromethoxy substitution offers a defined substitution pattern that can be useful when a project requires a fluorinated aryl fragment. However, coupling performance is not determined by the boronic acid alone; the electrophile, catalyst, base, solvent, concentration, temperature, and work-up method all influence the outcome.

Application Matching

• Medicinal chemistry: suitable for introducing a fluorinated aryl fragment into analogues and screening compounds.
• Process research: useful when a reproducible, documented intermediate is required for route evaluation or scale-up studies.
• Agrochemical research: may serve as a building block for exploratory molecules containing aryl–aryl linkages.
• Custom synthesis: appropriate when the target route requires a para-trifluoromethoxy phenyl unit and a cross-coupling-compatible partner.

How It Is Used in Suzuki Coupling

When I assess this product for Suzuki coupling, I first confirm the identity and quality of the boronic acid, then review the reaction partner and planned scale. The process normally begins with a suitable aryl or heteroaryl halide, a base, a catalyst system, and a solvent selected for the substrate combination. The reaction is then monitored using an appropriate analytical method, followed by filtration, extraction, purification, or crystallization as required by the route.

Practical Decision Points

1. Check substrate compatibility: confirm that the halide or related electrophile is appropriate for the intended coupling conditions.
2. Review purity requirements: determine whether the project needs research-grade material or a tighter process specification.
3. Control water and handling: use the conditions specified by the process team and consider the material’s moisture sensitivity during weighing and charging.
4. Define an analytical endpoint: monitor conversion and impurity formation rather than assuming that a standard literature condition will transfer directly.
5. Evaluate isolation: check whether inorganic salts, palladium residues, unreacted boronic acid, or boronic acid-derived impurities require additional purification.

I advise against selecting a coupling condition solely from the product name. Some reactions perform better with a freshly prepared catalyst system, while others require modified bases, ligands, solvent mixtures, or temperature profiles. A small-scale feasibility experiment can reduce the risk of consuming a valuable electrophile before the route is understood.

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Storage and Handling Guidance

For storage, I recommend keeping 4-trifluoromethoxyphenylboronic acid in a tightly closed original container, protected from moisture, excessive heat, and direct light, unless the current SDS specifies different requirements. The material should be handled in a suitable laboratory or production environment with appropriate protective equipment and ventilation. Buyers should confirm whether the supplier recommends refrigeration or another temperature-controlled condition because the correct requirement can depend on packaging, stability data, and intended storage duration.

Before use, inspect the container, label, lot number, and material condition. If the material shows unexpected discoloration, caking, container damage, or other changes, quarantine it and consult the supplier before charging it into a reaction. I also recommend recording the opening date and maintaining traceability between the material lot, reaction batch, and analytical results.

How to Select a Reliable Supplier

A good supplier evaluation should cover more than price per kilogram. I recommend asking for the product specification, COA template or current COA, SDS, packaging description, available analytical methods, and an explanation of the standard release tests. For development and manufacturing projects, it is also useful to confirm change-notification practice, lot consistency, export support, and the supplier’s ability to discuss custom specifications.

MOQ, Pricing, and Lead Time

Pricing can change according to order quantity, assay requirement, packaging, raw-material availability, analytical workload, and delivery destination. Small research quantities may carry a higher unit cost, while larger orders may require production scheduling and a defined forecast. Lead time should therefore be confirmed for the exact quantity and specification instead of inferred from a general catalog listing.

Maison Chemical supports B2B inquiries by reviewing the required quantity, application stage, destination, documentation needs, and target specification before quotation. I recommend sending the CAS number, estimated annual demand, desired assay, packaging preference, and requested delivery window in the first inquiry. This allows the supplier to distinguish a laboratory sample request from a development or repeat-supply requirement.

Common Purchasing Mistakes

• Ordering by a similar product name without confirming the CAS number and molecular formula.
• Assuming that a stated assay automatically defines water content, residual solvents, or metal residues.
• Ignoring packaging and transport conditions for a moisture-sensitive boronic acid.
• Choosing the lowest quoted price without comparing documentation, batch size, lead time, and replacement policy.
• Scaling a reported Suzuki coupling procedure without checking substrate-specific conversion and impurity behavior.

Conclusion: A Practical Buying Decision

4-Trifluoromethoxyphenylboronic acid CAS 139301-27-2 is a useful fluorinated aryl building block, especially when a project requires Suzuki–Miyaura carbon–carbon bond formation. The most important buying factors are verified identity, fit-for-purpose purity, moisture-conscious handling, complete documentation, and dependable delivery rather than a nominal catalog description alone. Its performance must be confirmed in the specific reaction system and development stage.

As the next step, I suggest preparing a concise purchasing brief with the CAS number, required quantity, assay target, packaging, delivery location, and documentation requirements. Contact Maison Chemical for a product specification review, quotation, sample discussion, or project-based supply assessment. Our team can help clarify whether the requested grade and supply plan are appropriate for your research, development, or commercial sourcing needs.