The vast realm of chemical intermediates is populated by compounds that, while not end products themselves, are indispensable for the creation of countless materials that shape our modern world. Among these crucial compounds is 2-Amino-5-hydroxynaphthalene-1,7-disulfonic acid, identified by its CAS number 6535-70-2. This naphthalene derivative is a vital building block, particularly valued in the synthesis of dyes and pigments, but its utility extends to various research and industrial applications. Understanding its chemical nature is key for anyone looking to purchase or work with it.

Unpacking the Chemical Structure and Properties

The chemical formula for 2-Amino-5-hydroxynaphthalene-1,7-disulfonic acid is C10H9NO7S2, with a molecular weight of approximately 319.31 g/mol. Its structure features a naphthalene ring, which is a bicyclic aromatic hydrocarbon. Attached to this ring are several functional groups: an amino group (-NH2) at the 2-position, a hydroxyl group (-OH) at the 5-position, and two sulfonic acid groups (-SO3H) at the 1 and 7 positions. This specific arrangement of functional groups dictates its reactivity and physical properties.

The most significant property conferred by the two sulfonic acid groups is excellent water solubility. This makes the compound and its derivatives highly suitable for use in aqueous media, which is common in many industrial processes, including dyeing and certain chemical reactions. The amino and hydroxyl groups are sites of high reactivity. The amino group can undergo diazotization, a crucial step in the formation of azo dyes, while the hydroxyl group can participate in other reactions or influence the electronic properties of the molecule, thereby affecting the color and stability of the final product.

Applications Across Industries

The primary industrial application for 2-Amino-5-hydroxynaphthalene-1,7-disulfonic acid is as an intermediate in the synthesis of dyes and pigments. It is particularly important in the production of azo dyes, which constitute the largest class of synthetic dyes. These dyes are used extensively in the textile industry for coloring natural and synthetic fibers, as well as in the paper industry. The compound's contribution to water solubility and its reactive functional groups allow for the creation of dyes with vibrant colors and good fastness properties.

In addition to dyes, it also serves as a precursor for pigments. Pigments, unlike dyes, are insoluble colorants used in applications such as paints, inks, plastics, and coatings. The ability to form stable, colored azo compounds makes this intermediate valuable for pigment manufacturing where durability and resistance to environmental factors are essential.

Choosing a Reliable Source

For researchers and industrial buyers, sourcing high-quality 2-Amino-5-hydroxynaphthalene-1,7-disulfonic acid is critical. Reputable chemical suppliers, often located in manufacturing centers like China, offer this intermediate with guaranteed purity levels, typically above 70% assay or 99% by HPLC. When you buy from such manufacturers, you ensure consistent performance, predictable reaction outcomes, and efficient production processes. It is advisable to look for suppliers who provide comprehensive technical data and support, ensuring that you are making an informed purchase for your specific needs.

The versatility and essentiality of 2-Amino-5-hydroxynaphthalene-1,7-disulfonic acid underscore its importance in the chemical supply chain. Whether for large-scale industrial production or specialized research, securing a dependable source for this key intermediate is a fundamental step toward achieving success.