In the vast world of chemistry, precise identification of compounds is critical for safety, research, and commerce. The Chemical Abstracts Service (CAS) Registry Number is a unique numerical identifier assigned to every chemical substance described in the open literature. For procurement managers and research scientists, understanding CAS numbers, such as for intermediates like 7-Acetyl-3,4-dihydro-1,5-benzodioxepin (CAS 22776-09-6), is fundamental to ensuring accurate sourcing and application.

What is a CAS Number? A CAS Registry Number is a unique identifier consisting of three parts separated by hyphens. For example, the CAS number for 7-Acetyl-3,4-dihydro-1,5-benzodioxepin is 22776-09-6. This number is assigned to a specific chemical substance, irrespective of its common names or synonyms. This standardization is invaluable for international trade and scientific communication, preventing ambiguity and ensuring that everyone is referring to the exact same molecule.

The Significance for Buyers of Chemical Intermediates: When purchasing chemical intermediates, relying on the CAS number is the most reliable method to confirm you are procuring the correct substance. For instance, if you need to buy 7-Acetyl-3,4-dihydro-1,5-benzodioxepin for your pharmaceutical synthesis, specifying CAS 22776-09-6 to a supplier guarantees that you are ordering precisely that compound. This is especially important when dealing with complex molecules or when similar-sounding compounds exist.

Ensuring Quality and Reliability: Reputable chemical suppliers, particularly those in China, will prominently feature the CAS number on their product listings and documentation. When you search for a specific intermediate, like CAS 22776-09-6, look for manufacturers that provide comprehensive details, including:

  • Exact CAS Number: Verification that the CAS number matches your requirement.
  • Purity Levels: Ensuring the compound meets the necessary purity standards (e.g., 95%min for pharmaceutical applications).
  • Safety Data Sheets (SDS): Essential for understanding handling, storage, and hazard information.
  • Certificates of Analysis (CoA): Documents confirming lot-specific quality and purity.
  • Clear Contact Information: Facilitates inquiries for quotes, samples, and technical support.

Where to Purchase: Trusted chemical manufacturers and suppliers are the primary source for such intermediates. Websites of companies specializing in fine chemicals and pharmaceutical intermediates will typically list products with their CAS numbers, making it easy to search and order. For example, if you're looking to purchase 7-Acetyl-3,4-dihydro-1,5-benzodioxepin, a supplier specializing in heterocyclic compounds and providing detailed product specifications is your best bet.

In conclusion, understanding and utilizing CAS numbers is a fundamental practice for any buyer in the chemical industry. It ensures accuracy, safety, and efficiency when sourcing critical materials like pharmaceutical intermediates, empowering businesses to operate with confidence.