In the intricate world of chemistry, precise identification of compounds is paramount. This is where CAS Registry Numbers (CAS RNs) play an indispensable role. Assigned by the Chemical Abstracts Service, a division of the American Chemical Society, CAS RNs are unique numerical identifiers for chemical substances. Each CAS number consists of three parts separated by hyphens, the first part containing up to seven digits, the second part two digits, and the third part a single check digit.

For professionals in chemical procurement, research, and manufacturing, understanding the significance of CAS numbers is fundamental. For example, the compound 3,6-Dibromo-4,5-difluoro-1,2-benzenediamine is unequivocally identified by its CAS number: 1345627-73-7. This numerical label ensures that regardless of synonyms, trade names, or slight variations in nomenclature, the specific chemical entity being referenced is clear and unambiguous.

When you search for a chemical like 3,6-Dibromo-4,5-difluoro-1,2-benzenediamine, using its CAS number, 1345627-73-7, guarantees that you are finding information and suppliers for the exact substance you need. This is especially critical when dealing with specialized intermediates where subtle structural differences can lead to vastly different properties and applications. Relying on CAS numbers streamlines the procurement process, reduces the risk of errors, and ensures you are purchasing the correct material from a trusted supplier, such as those manufacturers and distributors who prominently feature this identifier.

The accuracy provided by CAS numbers extends beyond simple identification; it facilitates patent searches, regulatory compliance, and the compilation of chemical databases. Therefore, always verify the CAS number when sourcing chemicals to ensure you are getting the precise compound for your R&D or manufacturing needs.