4-Chlorophenylboronic acid, identified by CAS 1679-18-1, is an aromatic boronic acid used primarily as a building block in organic synthesis. Its molecular formula is C6H6BClO2, and its commonly reported molecular weight is approximately 156.37 g/mol. The molecule contains a boronic acid group attached to a chlorinated phenyl ring, making it useful for carbon–carbon bond-forming reactions, especially Suzuki–Miyaura coupling. At Maison Chemical, I supply this pharmaceutical and fine-chemical intermediate for research, process development, and commercial sourcing programs, subject to agreed specifications and quality documentation.
4-Chlorophenylboronic acid is also known as 4-chlorobenzeneboronic acid or para-chlorophenylboronic acid. The “4-chloro” designation indicates that the chlorine atom and boronic acid group occupy the para positions on the benzene ring. This defined substitution pattern gives synthetic chemists a practical route for introducing a substituted aryl group into more complex molecules.
The boronic acid functionality is the key reactive site, while the chloro substituent can remain available for further chemical transformation depending on the reaction design. In many synthetic routes, the material is used to couple with aryl, heteroaryl, or vinyl halides under suitable palladium-catalyzed conditions. Actual reaction performance depends on the catalyst system, solvent, base, temperature, water content, and substrate compatibility, so I recommend confirming conditions at laboratory scale before production use.
| Property | Information |
|---|---|
| Product name | 4-Chlorophenylboronic acid |
| CAS number | 1679-18-1 |
| Molecular formula | C6H6BClO2 |
| Approximate molecular weight | 156.37 g/mol |
| Functional groups | Aryl chloride and boronic acid |
Commercial descriptions commonly identify 4-Chlorophenylboronic acid as a solid chemical intermediate, often supplied as a crystalline powder. However, color, particle size, purity, residual solvent, and water content can vary by manufacturing method and specification. For this reason, I treat the customer-approved specification and certificate of analysis as the controlling documents for each order.
Arylboronic acids are valued because their boron-containing group can participate in cross-coupling chemistry under suitable conditions. In Suzuki–Miyaura reactions, the arylboronic acid generally reacts with an organic halide or related electrophile to form a new carbon–carbon bond. This enables the preparation of biaryl and heteroaryl structures that are frequently found in pharmaceutical research compounds, agrochemical discovery programs, and specialty materials.
The chlorine atom also contributes useful synthetic flexibility. It may be retained as part of the final molecule or used as a separate reaction handle in a later step, depending on chemoselectivity and process conditions. I do not recommend assuming that every reaction will show the same selectivity, because substrate structure and catalyst choice can materially affect the outcome.
4-Chlorophenylboronic acid is used as a pharmaceutical intermediate and research building block rather than as an active pharmaceutical ingredient. Medicinal chemists may use it to prepare substituted biaryl compounds for screening libraries, lead optimization, and route exploration. Its value is particularly relevant when a project requires a para-chlorinated aryl fragment combined with another aromatic or heteroaromatic unit.
The compound can also support the synthesis of advanced intermediates for agrochemical and specialty-chemical research. Its application is not limited to one final product class, because the boronic acid group provides a general coupling option across different molecular frameworks. Before selecting it for a manufacturing route, buyers should assess impurity control, reaction conversion, isolation method, and the removal of palladium or other process-related residues.
Research organizations and contract manufacturers may purchase this material for route scouting, scale-up studies, or custom intermediate production. At small scale, the main concern may be reaction suitability and availability, while at larger scale the evaluation usually expands to lot consistency, packaging, analytical release, and delivery planning. I can discuss these requirements before quotation so that the supply proposal matches the actual project stage.
Not every buyer requires the same grade or documentation package. A discovery laboratory may focus on identity and assay, while a regulated development program may require a defined impurity profile, residual solvent statement, elemental analysis, and traceability records. I therefore recommend defining the intended use before selecting the commercial specification.
A buyer should also confirm the required package size, storage conditions, retest approach, and shipping classification with the supplier. Boronic acids may be sensitive to moisture or prolonged unsuitable storage, and the correct handling approach should be based on the supplier’s safety documentation and product-specific assessment. I provide available technical documents for review during the purchasing process.
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When I evaluate a supply request, I first confirm the required assay and analytical methods. Typical purchasing discussions may include HPLC or GC-related purity reporting where applicable, water content, residual solvents, appearance, identification, and selected elemental or inorganic impurities. The exact tests should be agreed in writing rather than inferred from a generic catalog description.
Buyers should request a current certificate of analysis, safety data sheet, product specification, batch or lot identification, and packaging details. If the material is intended for a regulated pharmaceutical route, the customer may also need change-notification expectations, manufacturing-site information, and traceability documentation. I do not claim a certification or compliance status unless it is specifically documented and applicable to the supplied batch.
Minimum order quantity and lead time depend on available inventory, production scheduling, packaging, testing requirements, and destination. A small sample request and a multi-kilogram commercial order should not be evaluated using the same supply assumptions. I can provide a more accurate quotation after receiving the target quantity, destination, specification, and requested delivery window.
For planning purposes, buyers should ask whether the quoted material is from existing stock or a new production batch. They should also confirm whether additional release testing, special labeling, or export documents could affect the schedule. Clear information at the inquiry stage helps reduce avoidable delays between technical approval and purchase order placement.
A suitable supplier should be able to discuss both the chemistry and the practical requirements of delivery. I recommend comparing suppliers on product identity, specification transparency, batch consistency, documentation quality, communication speed, packaging suitability, and export experience rather than comparing price alone. A lower unit price may not represent the better option if it creates extra testing, rework, or schedule risk.
At Maison Chemical, I support customers from initial product confirmation through quotation and shipment coordination. My role is to clarify whether the requested material is available as a standard product or requires a tailored specification review. I also encourage buyers to share the application stage, because a research purchase, development batch, and recurring commercial supply may require different technical and commercial arrangements.
4-Chlorophenylboronic acid should be handled by trained personnel using the customer’s applicable chemical safety procedures. The correct personal protective equipment, ventilation, storage, and waste-management practices should be determined from the current safety data sheet and local requirements. I recommend avoiding exposure to moisture, heat, incompatible chemicals, and poorly controlled storage conditions unless the product documentation specifically supports those conditions.
The compound is a starting material or intermediate, not a universal solution for every coupling route. Reaction yield, selectivity, and work-up behavior can change with the electrophile, base, catalyst loading, solvent, and scale. Buyers should validate the complete process experimentally and assess downstream purification requirements before committing to a large-volume purchase.
4-Chlorophenylboronic acid CAS 1679-18-1 is a practical synthetic building block when a project requires a para-chlorinated aryl group and a boronic acid coupling function. Its strongest application is in the preparation of more complex molecules through Suzuki–Miyaura and related carbon–carbon bond-forming chemistry. The right purchasing decision depends not only on nominal purity, but also on documentation, lot consistency, packaging, delivery requirements, and confirmed process compatibility.
If you are sourcing this material, I suggest sending Maison Chemical the target quantity, required specification, application stage, destination, and desired delivery date. I can then review product availability, documentation, packaging, MOQ, and lead-time expectations for your project. Contact Maison Chemical for a technical and commercial quotation for 4-Chlorophenylboronic acid CAS 1679-18-1.
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