In the complex world of chemical procurement, precision and traceability are not just desirable; they are essential. At the core of this precision lies the Chemical Abstracts Service (CAS) Registry Number. Each unique chemical substance is assigned a CAS number, a universal identifier that eliminates ambiguity and ensures that professionals are referring to the exact same compound, regardless of language or nomenclature variations. For procurement managers, R&D scientists, and formulation chemists, understanding and utilizing CAS numbers is fundamental.

What is a CAS Number?
A CAS Registry Number is a unique numerical identifier assigned to every chemical substance described in the open scientific literature. It consists of three parts separated by hyphens, with the first part ranging from two to seven digits, the second part from two to seven digits, and the third part consisting of a single check digit. For example, the CAS number for 3,4-Dihydro-7-hydroxy-2(1H)-quinolinone is 22246-18-0. This system, managed by the Chemical Abstracts Service, a division of the American Chemical Society, is the most widely recognized and used method for identifying chemical substances globally.

Ensuring Accuracy in Procurement
When sourcing chemicals, especially intermediates like 3,4-Dihydro-7-hydroxy-2(1H)-quinolinone for pharmaceutical synthesis or OLED material development, using the correct CAS number is critical. Imagine ordering a specific chemical intermediate; without the CAS number, you might receive a different isomer, a related compound with slightly different properties, or even an entirely different substance. This can lead to failed synthesis, production delays, and significant financial losses. For example, if you are looking to buy 3,4-Dihydro-7-hydroxy-2(1H)-quinolinone, always specify CAS 22246-18-0 to your supplier to guarantee you receive the precise material needed.

Traceability and Regulatory Compliance
CAS numbers are also vital for regulatory compliance and traceability throughout the supply chain. Many regulatory bodies worldwide rely on CAS numbers for chemical inventory reporting, safety data sheet (SDS) generation, and hazard communication. When a supplier provides documentation or labels for a product, the inclusion of the correct CAS number ensures that the information pertains to the exact substance being handled. This is particularly important for intermediates used in regulated industries like pharmaceuticals.

Finding and Verifying CAS Numbers
Reputable chemical manufacturers and suppliers will prominently display the CAS number on their product listings, technical data sheets, and safety data sheets. Resources like the CAS database, and various chemical supplier websites, can be used to verify CAS numbers. When you request a quote for 3,4-Dihydro-7-hydroxy-2(1H)-quinolinone, ensure that the supplier clearly states CAS 22246-18-0. This simple step is a powerful quality check.

Conclusion
The CAS number is more than just a string of digits; it is the universal language of chemical identity. For procurement professionals and scientists, it is an indispensable tool for ensuring accuracy, facilitating traceability, and maintaining regulatory compliance. Always insist on using and verifying CAS numbers when sourcing chemicals, including specialized intermediates like 3,4-Dihydro-7-hydroxy-2(1H)-quinolinone, to guarantee the integrity of your processes and products.