4-Pentylbenzeneboronic Acid CAS 121219-12-3: A B2B Sourcing Guide

If I am sourcing 4-Pentylbenzeneboronic acid, CAS 121219-12-3, I treat it as a specialty organic boronic acid intermediate requiring identity confirmation, application-fit evaluation, and supplier-controlled documentation. The compound is also known as (4-pentylphenyl)boronic acid and is generally identified by the molecular formula C₁₁H₁₇BO₂, with a calculated molecular weight of approximately 192.07 g/mol. It is primarily relevant to synthetic chemistry programs in which an aryl boronic acid is required for carbon–carbon bond formation, especially palladium-catalyzed cross-coupling research and related route development.

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For a reliable purchase, I recommend confirming the CAS number, molecular structure, required purity, quantity, packaging, analytical documentation, and shipping destination before requesting a quotation. Maison Chemical can support B2B buyers by reviewing the intended use, preparing a product inquiry, and coordinating available specifications and documents without making unsupported claims about a grade or test result that has not been confirmed for the specific batch.

Key Takeaways for B2B Buyers

• 4-Pentylbenzeneboronic acid is a boronic acid building block with CAS 121219-12-3 and approximate molecular weight of 192.07 g/mol.
• Its principal procurement value is as a specialized aryl component for synthetic route development and cross-coupling chemistry.
• Buyers should evaluate chemical identity, assay, impurity profile, analytical methods, packaging, MOQ, lead time, and regulatory documentation together.
• Maison Chemical can help organize a specification-based inquiry for laboratory, pilot, or commercial sourcing requirements.

What Is 4-Pentylbenzeneboronic Acid?

4-Pentylbenzeneboronic acid is an aryl boronic acid in which a pentyl substituent is positioned at the para position of a phenylboronic acid ring. The boronic acid group provides the key reactive functionality, while the pentyl substituent contributes a hydrophobic alkyl segment that may be important when researchers are tuning molecular structure, solubility behavior, or physical properties in a target compound.

For purchasing and quality control, I use the CAS number 121219-12-3 as the primary identifier, but I do not rely on the CAS number alone. I also compare the product name, molecular formula, molecular weight, structural representation, lot-specific analytical data, and intended synthesis route. This cross-check helps reduce the risk of receiving a positional isomer, a differently substituted boronic acid, or a product described with inconsistent nomenclature.

Core Chemical Identity

How It Is Used in Organic Synthesis

I normally position this material as a specialty building block rather than as a finished active ingredient or general-purpose solvent. Aryl boronic acids are widely used in transition-metal-catalyzed cross-coupling chemistry, including Suzuki-type reactions, where the aryl group can be coupled with a suitable electrophilic partner under an appropriate reaction system. The actual performance depends on the reaction substrate, catalyst, base, solvent, temperature, water content, and work-up procedure.

The para-pentyl substitution may be selected when a target molecule requires a longer alkyl chain attached to an aromatic ring. Potential users include medicinal chemistry teams, specialty materials researchers, process development groups, and academic or industrial laboratories preparing small libraries or advanced intermediates. I recommend validating the compound in the buyer’s own reaction system because boronic acid stability and conversion can vary substantially between routes.

Typical Application Scenarios

• Preparation of substituted biaryl or heteroaryl compounds through cross-coupling.
• Medicinal chemistry programs requiring a hydrophobic aryl substituent.
• Route scouting and process-development studies for specialty intermediates.
• Research on functional organic molecules where the pentylphenyl fragment is part of the design.

These application descriptions indicate common development contexts rather than guaranteed performance in a particular reaction. Before scale-up, I advise buyers to check reaction conversion, by-product formation, residual metal requirements, isolation behavior, and material stability under their defined conditions.

How to Select the Right Product Specification

The right specification depends on the stage of the project. For early discovery work, a smaller quantity with appropriate identity data may be sufficient, while process development typically requires tighter control of assay, related substances, water content, residual solvents, and batch-to-batch consistency. Commercial or regulated projects may also require a defined change-control process and a supplier quality questionnaire.

Recommended Specification Review

1. Confirm identity: Match the CAS number, molecular formula, molecular weight, and structure to the synthesis plan.
2. Define purity needs: State the target assay and identify whether specific regioisomers, boronic acid derivatives, or organic impurities must be controlled.
3. Request analytical evidence: Ask for a lot-specific COA and, when relevant, supporting HPLC, NMR, GC, LC-MS, water, or residual-solvent information.
4. Review physical handling: Confirm packaging, recommended storage, shipping conditions, and any stated sensitivity to moisture, heat, or prolonged exposure to air.
5. Match quantity to project stage: Separate sample, laboratory, pilot, and repeat-order requirements in the inquiry.

I do not recommend selecting a supplier solely because a catalog lists the correct CAS number. The buyer should confirm whether the quoted material is in stock, made to order, or subject to a new production schedule. A clear specification at the inquiry stage also makes it easier to compare quotations on an equivalent basis.

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Procurement Factors: MOQ, Lead Time, and Documentation

MOQ and lead time for specialty intermediates can vary according to inventory, production planning, raw-material availability, testing requirements, and destination-country logistics. I therefore recommend asking for a written quotation that separates product price, packaging, freight, estimated dispatch time, and any additional analytical or documentation charges. A quotation should also state whether the price applies to a specific quantity tier.

For international B2B purchasing, I typically request the following documents before approval: commercial invoice details, packing information, safety data sheet, certificate of analysis, product specification, and transport classification where applicable. Some projects may also require origin information, a statement regarding restricted substances, or customer-specific quality forms. These requirements should be agreed before shipment rather than introduced after the order is placed.

Information to Include in an Inquiry

• Product name and CAS 121219-12-3.
• Required quantity, target purity, and acceptable delivery schedule.
• Intended application or synthesis stage, where disclosure is permitted.
• Required analytical documents and preferred test methods.
• Packaging preference, shipping destination, and importer requirements.
• Whether a sample, pilot quantity, recurring supply, or custom production discussion is needed.

Providing these details allows Maison Chemical to assess the request more efficiently and avoid a quotation based on incomplete assumptions. If the buyer has an internal specification, I recommend attaching it so that the supplier can identify any differences between the requested standard and the available product documentation.

How to Evaluate a Supplier

When I evaluate a supplier for 4-Pentylbenzeneboronic acid, I look for consistency between commercial communication, technical documents, and logistics execution. The supplier should be able to identify the material clearly, explain the available grade or specification, and provide batch-relevant documentation where applicable. I also consider whether the supplier understands the difference between a research quantity and a scale-up requirement.

Supplier Evaluation Checklist

• Can the supplier confirm CAS 121219-12-3 and the expected chemical structure?
• Is the quoted purity clearly defined, and is it supported by a lot-specific COA when available?
• Are packaging and storage recommendations stated in writing?
• Can the supplier explain sample availability, MOQ, lead time, and repeat-order planning?
• Are SDS, specification, and shipping documents available for the destination market?
• Can the supplier respond to technical questions without overstating unverified performance?
• Is there a practical contact for handling document updates, shipment coordination, and quality questions?

Maison Chemical approaches this type of request as a specification-led B2B sourcing project. I can help organize the buyer’s requirements, clarify which documents are needed, and coordinate a quotation based on quantity and destination. Availability, exact purity, packaging, and lead time should be confirmed for each inquiry because they may change by batch and order scale.

Common Sourcing Mistakes

One common mistake is ordering by a shortened product name without confirming the para substitution pattern. Another is comparing suppliers using different purity definitions or analytical methods, which can make apparently similar offers difficult to evaluate. Buyers also sometimes request a delivery date before checking whether the material is available from inventory or requires production.

A further risk is treating a catalog description as a complete quality package. For development and scale-up work, I recommend reviewing the actual specification, COA format, packaging, storage conditions, and change-notification expectations. If the compound will enter a regulated or customer-audited process, those quality requirements should be discussed before the first purchase.

Final Sourcing Recommendation

4-Pentylbenzeneboronic acid CAS 121219-12-3 is best sourced as a defined organic synthesis intermediate with identity, purity, documentation, and logistics evaluated together. Its aryl boronic acid functionality makes it relevant to cross-coupling and related synthetic programs, while the pentyl substituent may support the structural requirements of specialized target molecules. The material should still be tested and qualified within the buyer’s own route before larger-scale commitment.

My recommended next step is to prepare an inquiry containing the CAS number, required quantity, target specification, documentation list, delivery location, and project timeline. Maison Chemical can then review the request and provide availability, quotation, packaging, and supplier support information subject to confirmation for the specific order. This approach gives procurement and technical teams a clearer basis for comparing offers and reducing avoidable sourcing risk.

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