For professionals in the pharmaceutical and fine chemical industries, understanding the precise specifications of chemical intermediates is fundamental to successful research, development, and manufacturing. 2-methyl-4-nitro-5-propylpyrazole-3-carboxylic acid (CAS: 139756-00-6) is a prime example of an intermediate where detailed specifications directly impact its usability and efficacy in downstream synthesis processes, most notably in the production of Sildenafil.

Defining the Essential Parameters

When you intend to buy 2-methyl-4-nitro-5-propylpyrazole-3-carboxylic acid, several key parameters must be carefully reviewed. These specifications not only define the quality of the product but also its suitability for specific chemical reactions. Reliable manufacturers and suppliers will clearly list these details:

  • Purity: This is arguably the most critical specification. For 2-methyl-4-nitro-5-propylpyrazole-3-carboxylic acid, a minimum purity of 97% is commonly required. Higher purity grades may be available for more sensitive applications. Suppliers should provide a Certificate of Analysis (CoA) detailing the tested purity and the analytical methods used (e.g., HPLC, GC).
  • Appearance: The physical state and color of the compound are important indicators. This intermediate is typically described as a 'Yellow to Orange solid'. Significant deviations in color or physical form might suggest contamination or degradation.
  • Molecular Formula and Weight: C8H11N3O4 and a molecular weight of approximately 213.19 g/mol are fundamental identifiers. These ensure you are procuring the correct chemical entity.
  • CAS Number: The Chemical Abstracts Service (CAS) Registry Number, 139756-00-6, is a unique identifier that guarantees you are referencing the specific compound across different databases and suppliers.
  • Solubility: Understanding the solubility profile (e.g., in DMSO, Methanol) is crucial for planning reaction conditions and work-up procedures.
  • Storage Conditions: Proper storage, often recommended at 2-8°C for this compound, is vital for maintaining its stability and purity over time.

The Importance of Verified Suppliers

Procurement managers should seek out suppliers who are transparent about these specifications. Purchasing from established manufacturers, especially those in China known for fine chemical production, can be advantageous for both quality and price. When comparing options to buy 2-methyl-4-nitro-5-propylpyrazole-3-carboxylic acid, always ensure the supplier's documentation matches the required standards. Keywords like 'high purity 139756-00-6', 'pharmaceutical intermediate supplier', or 'buy 2-methyl-4-nitro-5-propylpyrazole-3-carboxylic acid reliable manufacturer' will assist in finding suitable vendors.

Impact on Synthesis and Research

Adhering to these specifications ensures that the intermediate will behave predictably in synthesis. For example, the nitro group can be reduced to an amine, and the carboxylic acid can be esterified or converted to an amide, enabling further functionalization. These reactions are central to building more complex molecules like Sildenafil. By ensuring the quality of this foundational intermediate, researchers and manufacturers can achieve higher yields, reduce purification steps, and ultimately accelerate their R&D timelines and manufacturing efficiency.