Industrial Purity Specifications for 3-Bromo-4-fluoronitrobenzene (CAS 701-45-1)
- Critical Assay Standards: Industrial grade requires ≥99% purity to minimize downstream purification costs in API synthesis.
- Analytical Verification: GC and HPLC methods are essential to confirm the absence of isomeric impurities like 2-Bromo-1-fluoro-4-nitrobenzene.
- Supply Chain Reliability: Consistent COA documentation and bulk pricing stability are paramount for large-scale manufacturing.
In the landscape of fine chemical intermediates, 3-Bromo-4-fluoronitrobenzene (CAS 701-45-1) serves as a critical building block for the synthesis of complex pharmaceutical architectures, including N-fused tricyclic indoles and benzofuran derivatives. For process chemists and procurement managers, understanding the nuanced differences between reagent-grade and industrial-grade specifications is vital. The molecular formula C6H3BrFNO2 and molecular weight of 220 g/mol define the stoichiometry, but the industrial purity profile dictates the success of the subsequent manufacturing process.
As a premier global manufacturer, NINGBO INNO PHARMCHEM CO.,LTD. emphasizes that bulk procurement strategies must prioritize batch-to-batch consistency over spot pricing. This article details the technical specifications, analytical verification methods, and supply chain considerations necessary for securing high-quality intermediates.
Standard Assay and Impurity Profiles for Industrial Use
When evaluating suppliers, the distinction between 95% and 99% assay values is not merely numerical; it represents a significant difference in downstream processing. Reagent-grade materials often sit at 95% purity, suitable for small-scale laboratory R&D. However, large-scale API production demands ≥99% purity to prevent the accumulation of halogenated impurities that are difficult to remove during crystallization.
The physical properties of the compound provide immediate quality indicators. The melting point should strictly align with the range of 55°C to 56.5°C. Deviations below 55°C often indicate the presence of unreacted starting materials or isomeric byproducts. Similarly, the boiling point is predicted at 250.6±20.0 °C, and the density should measure approximately 1.808 g/cm³. Visual inspection also plays a role; high-quality batches present as white or colorless to light yellow solids. Dark orange discoloration can suggest oxidation or thermal degradation during the manufacturing process.
Impurity profiles must be meticulously controlled. The primary concern is the positional isomer, often referred to as 2-Bromo-1-fluoro-4-nitrobenzene. While chemically similar, this isomer can alter reaction kinetics in nucleophilic aromatic substitution steps. Therefore, industrial specifications must explicitly limit isomeric content to <0.5% to ensure reaction yield stability.
Analytical Methods for Verifying ≥98% Purity
Reliable quality control relies on robust analytical methodologies. Gas Chromatography (GC) is the standard for assessing volatile impurities and overall assay. A specification of >95.0%(GC) is common for smaller packs, but bulk industrial orders should mandate >99.0% via GC or HPLC. The InChIKey FAWMTDSAMOCUAR-UHFFFAOYSA-N serves as the digital fingerprint for the substance, ensuring that the correct structural isomer is being analyzed.
For comprehensive verification, proton NMR (1H NMR) should be utilized to confirm the substitution pattern on the benzene ring. The aromatic region will display distinct coupling constants due to the fluorine and bromine substituents. Additionally, water content must be monitored, as the compound is only slightly soluble in water, and excess moisture can interfere with anhydrous reaction conditions typically required for nitro-aromatic substitutions.
Safety data is equally critical for handling protocols. The substance carries GHS07 signaling with hazard statements H302 (Harmful if swallowed), H315 (Causes skin irritation), and H335 (May cause respiratory irritation). Proper storage involves keeping the material sealed in dry conditions at room temperature to prevent hydrolysis or clumping. A compliant Safety Data Sheet (SDS) must accompany every shipment, detailing precautionary statements such as P261 (Avoid breathing dust/fume) and P280 (Wear protective gloves/eye protection).
Importance of COA Consistency in API Synthesis
The Certificate of Analysis (COA) is the contractual backbone of B2B chemical procurement. Inconsistent COAs lead to failed validation batches and regulatory delays. Buyers must ensure that the COA lists not only the assay percentage but also specific impurity limits, residual solvents, and heavy metal content. For a global manufacturer like NINGBO INNO PHARMCHEM CO.,LTD., maintaining a unified quality standard across all production batches is non-negotiable.
Market intelligence suggests significant price volatility based on pack size and purity. While small gram-scale quantities may command prices upwards of $149 per gram due to packaging and handling costs, bulk kilogram orders should reflect a significantly reduced bulk price per unit. Procurement teams should negotiate based on tonnage capabilities rather than spot market rates. Supply ability should be verified to ensure the manufacturer can meet demands ranging from grams to tons without interruption.
Furthermore, the synthesis route employed by the manufacturer impacts the impurity profile. Common production involves the bromination of 4-fluoronitrobenzene using bromine and an iron powder catalyst at elevated temperatures (approx. 140 °C). Optimizing this reaction yield, historically around 55-60% in older literature, is key to cost-effective production. Modern processes aim to improve this yield while minimizing poly-brominated side products.
When sourcing high-purity 3-Bromo-4-fluoronitrobenzene, buyers should request historical COA data to verify long-term consistency. This due diligence mitigates the risk of receiving off-spec material that could compromise an entire production run. The chemical is also known synonymously as 3-Bromo-4-fluoro-1-nitrobenzene, and ensuring nomenclature consistency across documentation prevents logistical errors.
Procurement Strategy and Technical Support
Effective procurement extends beyond price negotiation. It involves establishing a technical partnership with the supplier. Key considerations include:
- Packaging Integrity: Ensure packaging prevents moisture ingress, typically using double-lined bags or sealed drums for bulk quantities.
- Regulatory Compliance: Verify HS Code 29049090 classification for customs clearance to avoid shipment delays.
- Scalability: Confirm the supplier's capacity to scale from pilot plant quantities to full commercial production without altering the manufacturing process parameters.
In conclusion, securing 3-Bromo-4-fluoronitrobenzene for industrial applications requires a rigorous focus on purity specifications, analytical verification, and supply chain reliability. By prioritizing manufacturers who provide transparent COAs and consistent industrial purity, pharmaceutical companies can safeguard their synthesis routes and maintain competitive production timelines. NINGBO INNO PHARMCHEM CO.,LTD. remains committed to delivering these high standards to the global market.
| Parameter | Specification (Industrial Grade) | Test Method |
|---|---|---|
| Appearance | White to Light Yellow Solid | Visual |
| Purity (Assay) | ≥ 99.0% | GC / HPLC |
| Melting Point | 55.0°C - 56.5°C | DSC / Capillary |
| Moisture Content | ≤ 0.5% | Karl Fischer |
| Isomeric Impurities | ≤ 0.5% | GC-MS |