4-Trifluoromethylphenylboronic acid, CAS 128796-39-4, is primarily used as an aryl boronic acid coupling partner in organic synthesis. I use this type of building block to introduce a para-trifluoromethyl-substituted phenyl group into more complex molecules, especially through palladium-catalyzed Suzuki–Miyaura cross-coupling. The compound combines a reactive boronic acid group with a strongly electron-withdrawing trifluoromethyl substituent, making it useful when a synthetic target requires both aryl-group installation and fluorine-containing molecular properties. Its suitability still depends on the reaction substrate, catalyst system, base, solvent, purity, and handling conditions.
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4-Trifluoromethylphenylboronic acid is an organoboron compound containing a phenyl ring, a boronic acid functional group, and a trifluoromethyl group positioned para to the boronic acid-derived reactive site. It is commonly described by the formula C7H6BF3O2, with an approximate molecular weight of 189.93 g/mol. The CAS number is 128796-39-4.
The boronic acid group is the main synthetic handle. Under suitable cross-coupling conditions, the aryl group attached to boron can be transferred to an aryl, heteroaryl, vinyl, or other compatible electrophilic partner, while the boron-containing portion is removed during the reaction sequence. The para-trifluoromethyl group remains attached to the aromatic ring and becomes part of the final product.
The most established use is Suzuki–Miyaura coupling with aryl halides or related electrophilic substrates. In a typical reaction design, 4-trifluoromethylphenylboronic acid supplies the 4-trifluoromethylphenyl fragment, while the second coupling partner supplies the other portion of the biaryl or aryl–heteroaryl product. Palladium catalysts are frequently used, although the exact catalyst, ligand, base, solvent, temperature, and reaction time must be selected through substrate-specific development.
This transformation is valuable because it can form carbon–carbon bonds under conditions compatible with many functional groups. Chemists may use it to prepare substituted biaryls, heteroaryl aromatics, and intermediates for medicinal chemistry or advanced materials research. A common development approach is to begin with approximately 1.0–1.5 molar equivalents of the boronic acid relative to the limiting electrophile, then adjust the ratio after monitoring conversion and selectivity.
The compound is also used as a convenient source of a trifluoromethyl-substituted aryl unit. The CF3 group can influence molecular lipophilicity, electronic distribution, metabolic behavior, and conformational characteristics, although the effect must be evaluated for each target structure rather than assumed in advance. For this reason, the material is relevant to discovery chemistry programs that prepare libraries of structurally related aromatic compounds.
In a medicinal chemistry workflow, a researcher may compare a non-fluorinated phenyl analogue with a para-trifluoromethyl analogue to study changes in biological activity or physicochemical behavior. The boronic acid therefore functions not only as a coupling reagent but also as a way to introduce a defined fluorinated substituent at a late or intermediate stage of synthesis.
4-Trifluoromethylphenylboronic acid can be used to construct biaryl and heteroaryl compounds during lead generation, analogue synthesis, and structure–activity relationship studies. Its value is greatest when a project needs rapid access to multiple aromatic variants from a common scaffold. Researchers may couple it with bromides, iodides, and selected chlorides or pseudohalide-type substrates, but reactivity varies substantially between substrates.
For medicinal chemistry, I recommend treating the compound as a building block rather than as a guaranteed high-yield solution. The final result depends on steric hindrance, heteroatom coordination, catalyst deactivation, boronic acid stability, and purification requirements. Small-scale parallel screening can help identify whether the selected coupling conditions are appropriate before the route is transferred to larger batches.
Fluorinated aromatic fragments are also found in research programs for crop-protection compounds and other fine chemicals. In these applications, the compound may be used to prepare advanced intermediates rather than the final active ingredient. The para-substituted structure provides a defined substitution pattern that can support systematic route planning and analogue comparison.
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Biaryl and heteroaryl products prepared from this building block may be investigated in materials-related chemistry, including studies of conjugated structures and functional aromatic systems. I would describe this as a research and intermediate-building application, because the commercial relevance depends on the specific target, scale, and performance requirements. The compound is not itself a finished material or a universal performance additive.
| Consideration | Why It Matters | Practical Question |
|---|---|---|
| Coupling partner | Electrophile structure strongly affects conversion and selectivity. | Is the substrate an aryl bromide, iodide, chloride, or another compatible partner? |
| Base and solvent | They influence boron activation, catalyst behavior, and product stability. | Has the system been screened for solubility and phase behavior? |
| Purity and water content | Impurities and uncontrolled moisture can affect reproducibility. | Are assay, identity, and storage data available for the batch? |
| Scale and packaging | Handling requirements change as the project moves from discovery to production. | Can the supplier support laboratory, pilot, or repeat procurement volumes? |
In a practical reaction screen, chemists may test catalyst loadings in a range such as 0.5–2 mol%, but this is a development range rather than a specification or guaranteed optimum. Some substrates require different ligand systems, higher catalyst loading, a modified base, or an alternative solvent. I advise using analytical monitoring, such as chromatographic conversion and product-area assessment, instead of relying only on reaction time.
Buyers may encounter this product as a research-grade or synthesis-grade solid, with specifications defined by assay, appearance, identification, residual solvents, water content, and related substances. The precise specification should be confirmed against the intended application and the supplier’s current batch documentation. A catalog description alone may not provide enough information for process development or regulated procurement.
For early-stage screening, a smaller package can reduce inventory exposure while the reaction is being evaluated. For route development, repeatability becomes more important, so I recommend confirming whether the supplier can provide consistent analytical documentation across batches. If the compound is sensitive to moisture, heat, or prolonged storage, packaging and storage instructions should be reviewed before purchase and incorporated into the laboratory’s material-control procedure.
Before ordering, I recommend requesting the product specification, certificate of analysis, analytical identification information, and available impurity or residual-solvent data. These documents help the chemist determine whether the material is suitable for discovery work, process research, or a more controlled manufacturing environment. They also provide a reference point when comparing different batches or suppliers.
Availability, minimum order quantity, packaging, lead time, and export documentation can influence the total project cost as much as the unit price. A reliable B2B supplier should communicate whether the quoted material is in stock, made to order, or subject to production scheduling. I also recommend confirming whether technical questions can be answered by a knowledgeable contact rather than handled only through a general sales channel.
The best supplier is not necessarily the one offering the lowest listed price. For a synthetic intermediate, dependable batch information, suitable packaging, responsive communication, and repeat supply may reduce the risk of delays during route development. Maison Chemical supports B2B inquiries for 4-trifluoromethylphenylboronic acid CAS 128796-39-4 by discussing required quantity, specification expectations, packaging, documentation, and delivery destination before quotation.
4-Trifluoromethylphenylboronic acid CAS 128796-39-4 is used primarily to build carbon–carbon bonds and introduce a 4-trifluoromethyl-substituted phenyl group into more complex molecules. Its strongest fit is in Suzuki–Miyaura coupling and related synthetic programs where a fluorinated aromatic fragment is required. It can support pharmaceutical discovery, fine chemical intermediate synthesis, agrochemical research, and selected functional-material investigations.
As a next step, I recommend defining the target coupling partner, required quantity, acceptable specification, and documentation level before requesting a quotation. Maison Chemical can review these B2B requirements and provide supply information for the requested grade, package size, and destination. This approach helps align the material with the actual reaction plan instead of selecting a product based only on its name or CAS number.
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