For any scientist or procurement specialist, understanding the exact specifications of a chemical compound is fundamental to its successful application. This holds true for 3,5-Diiodo-L-tyrosine dihydrate (CAS 18835-59-1), a vital fine chemical intermediate. This article outlines the critical specifications to consider when you plan to buy this compound, ensuring you acquire the precise grade needed for your biochemical research or pharmaceutical synthesis projects.

The primary identifier for any chemical is its CAS number, which for 3,5-Diiodo-L-tyrosine dihydrate is 18835-59-1. This unique identifier ensures you are referencing the correct chemical entity. Beyond the CAS number, several other specifications dictate the suitability of the compound for specific applications. These include its physical appearance, purity level, and sometimes specific optical rotation or solubility characteristics.

Appearance: Typically, 3,5-Diiodo-L-tyrosine dihydrate is described as a 'light yellow crystalline powder'. This visual characteristic is an initial indicator of the product's physical form and can sometimes hint at its purity or any potential degradation. When purchasing, confirming this description aligns with expectations is a good practice. If you encounter significant deviations, it warrants further inquiry with the supplier.

Purity: This is arguably the most crucial specification for any fine chemical intermediate. For 3,5-Diiodo-L-tyrosine dihydrate, purity levels commonly cited are 98.5% or 99%. High purity is essential for applications in pharmaceutical synthesis, where even minor impurities can lead to unwanted side reactions, affect the yield of the desired product, or compromise the safety and efficacy of the final drug. In biochemical research, high purity ensures the reliability and reproducibility of experimental results, particularly in sensitive assays or mechanistic studies.

Optical Rotation: As a chiral molecule, 3,5-Diiodo-L-tyrosine dihydrate exhibits optical activity. Specifications often include its specific rotation, for example, '[α]D -20.70° (20°C, c=2.5, 0.1N NaOH/H2O)' or similar values. This measurement confirms the enantiomeric purity of the sample and is vital for applications where stereochemistry is critical, such as in the synthesis of enantiomerically pure pharmaceuticals.

Other Specifications: Depending on the supplier and the intended use, other specifications might be provided, including melting point (often listed with decomposition), solubility in various solvents, and moisture content (indicated by the 'dihydrate' designation). These details can further inform your purchasing decision.

When you decide to buy 3,5-Diiodo-L-tyrosine dihydrate, it is imperative to request a Certificate of Analysis (CoA) from the manufacturer or supplier. The CoA provides lot-specific data for the key specifications, confirming that the product meets the stated quality standards. This document is essential for quality assurance and regulatory compliance in many industries.

For researchers and procurement managers looking for this chemical, engaging with manufacturers in China is often an avenue to access competitive pricing and reliable supply. However, thorough due diligence is required to ensure the selected supplier consistently meets these critical specifications. Always inquire about product testing methods and ask for sample batches if possible, to verify product quality before making a large purchase.