For procurement managers and R&D scientists in the chemical industry, understanding the purity and specifications of Phosphorus Oxybromide (CAS 7789-59-5) is fundamental to ensuring successful synthesis and product quality. As a key intermediate, the performance of POBr3 in reactions is directly linked to its composition. This guide will outline what buyers should consider when evaluating suppliers and requesting product details.

Phosphorus Oxybromide is typically supplied with a purity of 98% or 99% minimum. While both grades are useful, the choice often depends on the specific application. For highly sensitive reactions, such as in advanced pharmaceutical intermediate synthesis or catalyst development, a 99% purity grade is often preferred. This higher purity minimizes the presence of impurities that could lead to unwanted side reactions, reduced yields, or contamination of the final product. When you buy Phosphorus Oxybromide, always verify the stated purity and the analytical methods used for its determination.

Key specifications to look for include:

  • Assay (Purity): Typically listed as ≥98% or ≥99% (often by HPLC or GC).
  • Moisture Content: Due to its reactivity with water, low moisture content is desirable. Manufacturers often specify a maximum allowable moisture level, for example, ≤0.5%.
  • Appearance: Phosphorus Oxybromide is usually described as colorless to grey-brown crystals or a fused mass. Any significant deviation might indicate contamination or degradation.
  • Melting Point: Reported melting points vary slightly, commonly around 56°C. This can be a useful indicator of purity.
  • Boiling Point: Approximately 192°C at atmospheric pressure, though it is often handled in molten form for specific applications.

Other important identifiers include the CAS number (7789-59-5), molecular formula (Br3OP), and molecular weight (approximately 286.69 g/mol). Synonyms such as Phosphoryl bromide and Phosphorus tribromide oxide are also commonly used.

When sourcing from a manufacturer, it's beneficial to request a Certificate of Analysis (CoA) with each batch. A CoA provides a detailed report of the actual test results for a specific lot, confirming it meets the agreed-upon specifications. This documentation is vital for quality assurance and regulatory compliance.

As a leading supplier of Phosphorus Oxybromide, we provide comprehensive technical data and CoAs upon request. Our commitment is to ensure that every batch of POBr3 we supply meets the highest standards, enabling our customers to achieve optimal results in their syntheses. Contact us to learn more about our product specifications and to buy high-purity Phosphorus Oxybromide for your industrial needs.