4-Bromocatechol for Brominated Phenolic Antioxidants: Controlling Chromaticity Shift During Storage
High-Purity 4-Bromocatechol (CAS 17345-77-6) for Brominated Phenolic Antioxidants: Technical Specifications and COA Parameters
For R&D managers formulating brominated phenolic antioxidants, the purity profile of 4-Bromocatechol (also referred to as 4-Bromo-1,2-benzenediol or 4-Bromo-1,2-dihydroxybenzene) directly dictates the oxidative stability and color integrity of the final product. NINGBO INNO PHARMCHEM CO.,LTD. supplies this organic building block with a minimum purity of 98.0% (GC), typically appearing as a white to pale yellow crystalline powder. However, experienced process chemists know that the Certificate of Analysis (COA) must be scrutinized beyond the primary assay. Trace impurities, particularly residual bromine or over-oxidized quinone derivatives, can act as chromophores, accelerating discoloration during long-term storage. Our manufacturing process is optimized to minimize these species, but we always advise clients to refer to the batch-specific COA for exact impurity profiles. The synthesis route we employ ensures consistent isomer distribution, avoiding the formation of the 3-bromo isomer which can complicate downstream reactivity. For a deeper dive into how our product compares to established catalog offerings, see our article on drop-in replacement for Sigma-Aldrich 4-Bromocatechol and oxidation byproduct limits.
Auto-Oxidation of the Ortho-Dihydroxy Moiety: Mitigating Chromaticity Shift in Stored Antioxidant Formulations
The catechol functionality in 4-Bromobenzene-1,2-diol is both its strength and its Achilles' heel. While the ortho-dihydroxy arrangement provides excellent radical-scavenging capacity in brominated phenolic antioxidants, it is inherently prone to auto-oxidation, forming ortho-quinones. These quinones are intensely colored, even at ppm levels, leading to an undesirable chromaticity shift from pale yellow to deep brown or red in stored formulations. This degradation pathway is accelerated by light, trace metals, and elevated temperatures. In our field experience, the rate of color development is not solely a function of the 4-Bromocatechol purity but also of the headspace oxygen in the final packaging. We have observed that incorporating a nitrogen blanket during the final blending step of the antioxidant formulation can extend color stability by a factor of three. Furthermore, the choice of solvent or matrix for the antioxidant plays a critical role; aprotic solvents tend to slow the auto-oxidation compared to protic media. This hands-on knowledge is crucial for R&D managers aiming to meet stringent shelf-life specifications without resorting to excessive antioxidant loading.
Non-Standard Parameter: Viscosity Behavior and Crystallization Control in Sub-Ambient Bulk Handling
While standard specifications focus on melting point (typically 56-60°C) and purity, a critical non-standard parameter for bulk users is the material's behavior during sub-ambient transport and storage. 4-Bromocatechol as a solid is relatively stable, but when handled as a melt for liquid-phase reactions, its viscosity profile near the solidification point becomes crucial. We have documented that the melt viscosity exhibits a sharp, non-linear increase as the temperature drops below 65°C, which can lead to transfer line blockages if not properly heat-traced. More importantly, if the molten material is cooled too rapidly, it tends to form a glassy solid rather than a crystalline mass. This glassy state can trap residual solvents or impurities, leading to localized hotspots of discoloration upon reheating. Our technical team recommends a controlled cooling profile with seeding to ensure consistent crystallization. For those working with 4-Bromocatechol in fungicide intermediates, similar handling challenges are discussed in our article on 4-Bromocatechol for QoI fungicides and winter crystallization control.
Bulk Packaging and Supply Chain Integrity: IBC and 210L Drum Solutions for Industrial-Scale Synthesis
Maintaining product integrity from our reactor to your production line is non-negotiable. For industrial purity 4-Bromocatechol destined for large-scale antioxidant synthesis, we offer two primary packaging configurations: 210L steel drums with polyethylene liners and, for high-volume contracts, intermediate bulk containers (IBCs). The 210L drum is the workhorse for quantities up to 200 kg, providing robust protection against moisture and mechanical damage. For tonnage orders, IBCs offer logistical efficiency and reduced handling. Both packaging types are purged with nitrogen to displace oxygen, a critical step in preserving the low chromaticity of the product. Our logistics team coordinates with clients to ensure that the packaging is compatible with their unloading systems, whether they use drum warmers or IBC heating blankets. We focus strictly on the physical packaging and transport conditions; no claims regarding regulatory compliance such as EU REACH are made. The key is to prevent any ingress of moisture, which can promote hydrolysis and subsequent discoloration, even in the solid state.
| Parameter | Standard Grade | High-Purity Grade |
|---|---|---|
| Assay (GC) | ≥ 98.0% | ≥ 99.0% |
| Appearance | White to pale yellow powder | White crystalline powder |
| Melting Point | 56 - 60 °C | 57 - 59 °C |
| Single Impurity (max) | ≤ 1.0% | ≤ 0.5% |
| Color (APHA, 10% in Methanol) | ≤ 100 | ≤ 50 |
| Packaging | 210L drum / IBC | 210L drum / IBC |
Drop-in Replacement Strategy: Cost-Efficient 4-Bromocatechol with Identical Reactivity for Seamless Integration
For procurement managers, qualifying a new source of 4-Bromocatechol often involves lengthy requalification of downstream antioxidant products. Our product is engineered as a true drop-in replacement for existing supply chains. The Bromocatechol we manufacture exhibits identical regiochemistry and reactivity in the key alkylation or etherification steps used to produce brominated phenolic antioxidants. In comparative studies, the reaction kinetics and product distribution were indistinguishable from those obtained with higher-priced alternatives, provided the material is handled under inert atmosphere. The cost advantage stems from our optimized manufacturing process and economies of scale, not from any compromise on quality. We encourage clients to perform a direct side-by-side comparison in their specific formulation; our technical support team can provide samples and COA data to facilitate this. The transition is typically seamless, requiring no changes to reaction conditions or purification protocols.
Frequently Asked Questions
What is the minimum order quantity (MOQ) for 4-Bromocatechol?
Our standard MOQ is 1 kg for sample evaluation. For commercial production, we typically supply in 25 kg drums, with scalable volumes up to multi-ton contracts. Please contact our sales team for a tailored quotation based on your annual demand.
Can you provide a Certificate of Analysis (COA) with a focus on color stability?
Yes, our standard COA includes appearance and purity. Upon request, we can include a color stability test (APHA after accelerated aging) as an additional parameter. This helps predict the chromaticity shift in your stored antioxidant formulations.
What is the recommended storage condition to prevent discoloration?
Store in a cool, dry place away from light. For long-term storage, we recommend keeping the product under nitrogen in sealed containers. Avoid exposure to moisture and temperatures above 40°C to minimize auto-oxidation.
Is your 4-Bromocatechol suitable for use in food-contact antioxidant applications?
Our product is supplied as an industrial intermediate. It is the responsibility of the end-user to ensure that the final antioxidant formulation meets all relevant regulatory requirements for its intended use, including food-contact approvals. We do not make any claims regarding food-grade compliance.
What is the typical lead time for bulk orders?
Lead times vary depending on order size and current production schedules. Generally, for orders up to 500 kg, the lead time is 2-4 weeks. For tonnage quantities, we work closely with your procurement team to align production and shipping schedules, typically 6-8 weeks.
Sourcing and Technical Support
Securing a reliable supply of high-purity 4-Bromocatechol is critical for maintaining the quality and cost-effectiveness of your brominated phenolic antioxidant portfolio. At NINGBO INNO PHARMCHEM CO.,LTD., we combine deep chemical expertise with robust logistics to ensure that every shipment meets your technical specifications. Our team is ready to discuss your specific requirements, from impurity thresholds to packaging configurations. Explore our product page for detailed specifications: high-purity 4-Bromocatechol for organic synthesis. Ready to optimize your supply chain? Reach out to our logistics team today for comprehensive specifications and tonnage availability.