The vibrant world of organic pigments relies heavily on sophisticated chemical intermediates that enable the creation of specific colors with desired properties. Among these, 2'-Chloroacetoacetanilide (CAS 93-70-9), often abbreviated as AAOCA, stands out as a critical component for achieving brilliant yellow hues. Understanding its synthesis and chemical properties is essential for anyone involved in pigment manufacturing or the broader fine chemical industry.

Synthesis and Chemical Profile of AAOCA

2'-Chloroacetoacetanilide is typically synthesized through the reaction of o-chloroaniline with diketene. This process, carried out under controlled conditions, yields a white crystalline powder. Key chemical and physical properties include:

  • Molecular Formula: C10H10ClNO2
  • Molecular Weight: Approximately 211.65 g/mol
  • Appearance: White to off-white powder
  • Melting Point: Around 107°C
  • Purity: High purity, often exceeding 98%, is critical for optimal performance in pigment synthesis.

The presence of the chloro-substituted phenyl ring and the acetoacetanilide moiety makes AAOCA an effective coupling component. Its molecular structure is designed to react efficiently with diazonium salts during the azo coupling process, which is the cornerstone of azo pigment production.

The Azo Coupling Process and AAOCA's Role

Azo coupling is a chemical reaction where a diazonium salt reacts with a coupling component to form an azo compound, which is the basis for most azo dyes and pigments. In the synthesis of yellow pigments, 2'-Chloroacetoacetanilide acts as the coupling component. The reaction sequence can be simplified as:

1. Diazotization of an aromatic amine to form a diazonium salt.
2. Reaction of the diazonium salt with 2'-Chloroacetoacetanilide under specific pH and temperature conditions.
3. Precipitation and purification of the resulting pigment.

The precise molecular arrangement of AAOCA ensures that the resulting azo pigment possesses the desired color characteristics, such as hue, intensity, and transparency.

Why Purity Matters in Pigment Intermediate Supply

For pigment manufacturers, the quality of the 2'-Chloroacetoacetanilide used directly impacts the final pigment's performance. Impurities can lead to:

  • Off-Shades: Variations in hue or brightness.
  • Reduced Lightfastness: Premature fading of the pigment.
  • Poor Dispersion: Difficulty in incorporating the pigment into various media like paints or plastics.

Therefore, sourcing from a reputable manufacturer and supplier is paramount. A supplier offering high-purity 2'-Chloroacetoacetanilide (CAS 93-70-9) ensures that your pigment synthesis will yield the vibrant, durable yellows required by the market. If you are looking to buy or source this essential chemical, consider reaching out to us for reliable supply and competitive pricing from China.