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For researchers and formulators in the dye and pigment industries, a deep understanding of chemical intermediates is crucial for unlocking optimal product performance. 3-Hydroxy-N-naphthalen-1-ylnaphthalene-2-carboxamide (CAS 132-68-3), commonly known as Azoic Coupling Component 4 or Naphthol AS-BO, is a prime example of such an intermediate. This article explores its key chemical and physical properties, providing valuable insights for professionals looking to leverage its capabilities.
Chemically, 3-Hydroxy-N-naphthalen-1-ylnaphthalene-2-carboxamide is a naphthalene derivative with the molecular formula C21H15NO2 and a molecular weight of approximately 313.35 g/mol. Its structure features a hydroxyl group and an amide linkage, which are key to its functionality as a coupling component in azoic dyeing and pigment synthesis. The compound’s pKa value, around 8.73, indicates its mildly acidic nature, influencing its solubility and reactivity in different pH environments.
Physically, the compound typically presents as a light yellow to yellow powder, with a specified purity of ≥98.0%. This high degree of purity is essential for consistent color development and to prevent unwanted side reactions or impurities in the final dyed fabric or pigment. Its melting point is consistently reported in the range of 222-223°C, signifying its thermal stability within typical processing conditions.
Regarding solubility, 3-Hydroxy-N-naphthalen-1-ylnaphthalene-2-carboxamide is insoluble in water and sodium carbonate solutions but soluble in xylene. When dissolved in sodium hydroxide solution, it exhibits a yellow color and is generally stable in air. These solubility characteristics are important for formulators to consider when developing dyeing baths or pigment dispersions. The relatively high boiling point (around 479.3°C at 760 mmHg) also indicates its robustness under various manufacturing conditions.
The applications of Azoic Coupling Component 4 are primarily centered on its ability to react with diazonium salts to form insoluble azo dyes. This process is fundamental to azoic dyeing, particularly for cotton and viscose fibers, where it imparts excellent color depth and fastness. It is also a valuable intermediate in creating specific fast pigments and organic pigments, contributing to vibrant hues with good stability. For R&D scientists, understanding these properties allows for precise formulation and application development.
As a dedicated manufacturer and supplier, we offer high-quality 3-Hydroxy-N-naphthalen-1-ylnaphthalene-2-carboxamide. We encourage professionals to buy this critical intermediate to explore its full potential in their research and production. Reach out to us for detailed specifications and to obtain samples for your evaluation. Our commitment is to provide the chemical building blocks that drive innovation in your industry.
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