4-Ethylphenylboronic acid, identified by CAS 63139-21-9, is an aryl boronic acid used primarily as a building block in organic synthesis and cross-coupling research. Its molecular formula is commonly represented as C8H11BO2, with a calculated molecular weight of approximately 149.98 g/mol. I recommend that B2B buyers evaluate identity, assay, impurity profile, packaging, documentation, and supply continuity before placing a bulk order.
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At Maison Chemical, we support buyers who need to source this compound for pharmaceutical intermediates, agrochemical research, specialty chemicals, and medicinal chemistry programs. The most reliable purchasing process begins with a clear technical specification and ends with confirmation of batch documentation, logistics, and storage requirements. Because commercial availability and lead time can vary by quantity and production schedule, buyers should request a current quotation rather than rely on a fixed public price.
This guide is intended for procurement teams, chemical distributors, research organizations, process development groups, and manufacturers evaluating 4-Ethylphenylboronic acid for laboratory or production use. It is also useful for buyers comparing catalog supply with planned bulk procurement. I focus on practical sourcing decisions rather than presenting an unverified universal specification.
The compound may be relevant when a project requires an ethyl-substituted aryl boronic acid as a synthetic intermediate. However, the correct grade depends on the reaction, downstream purification process, regulatory environment, and intended scale. A material suitable for route scouting may not automatically be suitable for process development or commercial manufacturing.
4-Ethylphenylboronic acid contains an aryl boronic acid functional group and an ethyl substituent on the aromatic ring. In synthetic chemistry, the boronic acid group can participate in palladium-catalyzed carbon–carbon bond-forming reactions, including Suzuki-type coupling, when the reaction conditions and partner substrates are appropriate. The ethyl substituent can influence the electronic and steric characteristics of the resulting intermediate.
For purchasing and receiving control, I recommend using the complete product name together with CAS 63139-21-9. Buyers should also compare the supplier’s certificate of analysis with the approved internal material name, molecular formula, molecular weight, and analytical identification. CAS matching alone should not replace review of the actual batch documentation.
| Item | Reference information | Procurement relevance |
|---|---|---|
| Product | 4-Ethylphenylboronic acid | Use the full name on inquiries and purchase documents |
| CAS number | 63139-21-9 | Supports identity confirmation and supplier communication |
| Formula | C8H11BO2 | Useful for technical review and inventory systems |
| Calculated molecular weight | Approximately 149.98 g/mol | Useful for reaction calculations and analytical checks |
Suppliers may offer this material in research, standard commercial, or production-oriented grades, but grade names are not always standardized across the market. I advise buyers to compare the actual assay, impurity limits, water content where relevant, residual solvents, appearance, and analytical methods instead of selecting solely by a label such as “high purity.” A written specification is more useful than a general grade description.
For early reaction screening, a buyer may begin with a small quantity such as 1 g, 10 g, or 100 g, depending on the number of experiments. These quantities can help confirm reaction compatibility, isolation behavior, and analytical response before a larger commitment. The initial sample should come with enough documentation to determine whether the material is appropriate for scale-up evaluation.
For larger requirements, buyers should define the expected batch size, annual volume, delivery schedule, packaging format, and acceptance criteria. A 1 kg request may require a different production and logistics plan from a multi-kilogram or recurring order. Maison Chemical can review the requested quantity and discuss a supply approach based on the buyer’s specification and timing.
4-Ethylphenylboronic acid may be considered for synthetic routes involving aryl coupling chemistry, medicinal chemistry libraries, pharmaceutical intermediate development, and specialty molecule research. Its suitability depends on the coupling partner, catalyst system, solvent, base, temperature, and purification strategy. I recommend confirming performance through a controlled technical evaluation before approving a material for a critical manufacturing step.
For process development, the most important question is often not simply whether the compound reacts, but whether it performs consistently between batches. Buyers should examine conversion, selectivity, impurity formation, filtration behavior, and downstream purification requirements. These results should be generated in the buyer’s own process because supplier-level identity and assay data cannot predict every application outcome.
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Start by stating the required product name, CAS number, intended use, quantity, target assay, packaging, and delivery location. If the project requires a minimum assay such as 98%, identify it as a purchasing requirement rather than assuming every supplier uses the same threshold. Also specify whether limits are needed for water, residual solvents, related substances, or particular reaction-sensitive impurities.
A suitable supplier should be able to provide a batch-specific certificate of analysis or an equivalent quality document for the offered material. Depending on the application, buyers may request information from techniques such as nuclear magnetic resonance, high-performance liquid chromatography, mass spectrometry, or elemental analysis. The exact analytical package should match the risk level of the project and the buyer’s quality system.
Ask how the material is packaged, sealed, labeled, and protected during shipment. Boronic acids may require careful control of moisture exposure and handling conditions, but the appropriate storage instructions should come from the supplier’s product documentation and the buyer’s internal safety procedures. Do not transfer material into production inventory until the label, quantity, lot number, and documentation have been reconciled.
Price should be reviewed together with quantity, grade, packaging, shipping terms, payment terms, and documentation requirements. A lower unit price may not represent better value if it involves a long lead time, unsuitable packaging, or additional testing charges. For recurring demand, buyers should request a quotation that clearly separates product cost, analytical services, packaging, freight, and any applicable export documentation.
There is no responsible single price for 4-Ethylphenylboronic acid without knowing quantity, grade, destination, and delivery schedule. Minimum order quantity can vary according to available inventory, production economics, packaging configuration, and whether the requested specification is standard or customized. Buyers should ask for pricing at several quantity levels, such as 100 g, 1 kg, and a larger forecast volume, when planning a scale-up.
Lead time should be confirmed in writing for the exact lot and quantity being quoted. A supplier may have material available for immediate dispatch, while a larger or customized order may require production, testing, and release before shipment. I recommend adding sufficient schedule margin for quality review, import procedures, and receiving inspection instead of planning only around the supplier’s estimated dispatch date.
Maison Chemical approaches this evaluation through specification-based communication. We can review the buyer’s required quantity, target grade, documentation needs, packaging expectations, destination, and planned delivery date before preparing a commercial response. This helps reduce the risk of quoting a nominally correct product that does not match the buyer’s actual process or quality requirements.
One common mistake is using only a product name without including the CAS number or required quality criteria. Another is accepting a general purity statement without checking how purity was measured and whether related impurities are controlled. Buyers should also avoid assuming that a small research-pack specification automatically covers production use.
A further mistake is requesting a price without explaining the required quantity and delivery location. Freight, export documents, packaging, and testing can affect the final landed cost. Providing a complete inquiry at the start usually allows the supplier to return a more useful and comparable quotation.
For most B2B buyers, the best way to source 4-Ethylphenylboronic acid CAS 63139-21-9 is to treat the purchase as a controlled chemical supply project rather than a simple catalog transaction. Confirm identity, define the required quality profile, evaluate batch documentation, and compare the full delivered cost. Quantity, lead time, packaging, and intended application should all be discussed before order confirmation.
If you are planning to purchase this compound, contact Maison Chemical with the required quantity, target specification, destination, documentation needs, and expected delivery schedule. We can then review the inquiry and provide a practical quotation and supply recommendation based on the information available for your project.
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