In the intricate world of chemical procurement and research, precision is paramount. Every scientist, formulator, and procurement manager understands the need for unambiguous identification of chemical substances. This is where the Chemical Abstracts Service (CAS) Registry Number, commonly known as the CAS number, plays an indispensable role. It serves as a unique, universally recognized identifier for chemical compounds, ensuring that everyone is referring to the exact same substance.

What is a CAS Number?

A CAS number is a numerical sequence assigned by the Chemical Abstracts Service, a division of the American Chemical Society, to every unique chemical substance described in the open scientific literature. These numbers consist of three parts, separated by hyphens: the first two or three digits, followed by a hyphen, then two more digits, another hyphen, and finally a check digit. For example, the CAS number for 4-Amino-2-chloro-6,7-dimethoxyquinazoline is 23680-84-4.

Why is the CAS Number Crucial for Sourcing?

The CAS number is the bedrock of accurate chemical sourcing. In a global marketplace with countless chemicals and varying nomenclature, relying on names alone can lead to confusion and errors. Here's why the CAS number is indispensable:

  • Uniqueness: Each CAS number corresponds to only one specific chemical substance, eliminating ambiguity that can arise from different systematic names, common names, or trade names.
  • Universality: It is recognized worldwide by scientists, regulators, and commercial suppliers, facilitating international trade and communication.
  • Efficiency: When searching for a specific compound, such as 4-Amino-2-chloro-6,7-dimethoxyquinazoline, using its CAS number (23680-84-4) in search engines or supplier databases yields precise results, saving valuable time.
  • Regulatory Compliance: Many regulatory bodies and safety data sheets (SDS) utilize CAS numbers for identification and hazard communication.

Using CAS Numbers for Effective Procurement

When you need to buy a chemical, such as 4-Amino-2-chloro-6,7-dimethoxyquinazoline, using its CAS number is the most effective way to initiate your search. For instance, searching for 'CAS 23680-84-4 price' or 'buy 4-Amino-2-chloro-6,7-dimethoxyquinazoline CAS 23680-84-4' will directly connect you with suppliers offering this specific compound. This precision is vital when dealing with intermediates where slight variations can drastically alter their suitability for synthesis. When requesting quotes, always include the CAS number to ensure that you are comparing offers for the identical product from different manufacturers.

Beyond Identification: CAS Numbers and Supplier Databases

Supplier databases and chemical marketplaces are optimized to use CAS numbers for efficient indexing and searching. When a manufacturer lists their products, they invariably include the CAS number. This allows procurement professionals to quickly identify potential sources, compare specifications, and initiate inquiries. For example, identifying a reliable manufacturer for 4-Amino-2-chloro-6,7-dimethoxyquinazoline involves searching for 'CAS 23680-84-4 manufacturer China' to find entities with the capability and intention to supply this specific intermediate.

In essence, the CAS number is more than just a label; it is a powerful tool that underpins accurate chemical identification, efficient sourcing, and safe handling. Embracing its use ensures that your procurement efforts are precise, reliable, and successful, especially when dealing with specialized compounds like 4-Amino-2-chloro-6,7-dimethoxyquinazoline.