Agrochemicals

Trichloroacetyl Chloride (CAS No. 76-02-8) 

1. Basic Information

• Chemical Name: Trichloroacetyl chloride
• Synonyms: TCAC; Trichloroethanoyl chloride
• CAS Number: 76-02-8
• Molecular Formula: C₂Cl₄O
• Molecular Weight: 181.83 g/mol
• Appearance: Colorless to pale yellow fuming liquid
• Odor: Pungent, suffocating odor (similar to hydrochloric acid)
• Odor Threshold: <1 ppm

2. Physical and Chemical Properties

• Melting Point: -57°C (-71°F)
• Boiling Point: 118°C (244°F)
• Density: 1.62 g/cm³ at 20°C
• Refractive Index: 1.459 at 20°C
• Solubility:
  • Reacts violently with water/alcohols
  • Soluble in ether, benzene, chloroform
• Vapor Pressure: 15 mmHg at 20°C
• Flash Point: Non-flammable (but reacts violently with water)

3. Chemical Structure

     Cl  
      |  
Cl-C-CO-Cl  
      |  
     Cl

4. Hazards (GHS Classification)

• Corrosivity:
  • Causes severe skin burns (H314)
  • Causes serious eye damage (H318)
• Acute Toxicity:
  • Fatal if inhaled (H330)
  • Toxic if swallowed (H301)
• Environmental Hazards:
  • Very toxic to aquatic life (H400)
• NFPA Rating: Health 4, Flammability 0, Reactivity 2

5. Storage and Handling

• Storage:
  • Store in sealed glass/PTFE containers under dry inert gas (N₂/Ar)
  • Keep away from moisture, heat, and bases
• Handling:
  • Use full-face respirator with acid gas filters
  • Wear acid-resistant gloves (Viton®/neoprene)
  • Work in a fume hood with sash at ≤18 inches

6. Applications

• Chemical Synthesis: Production of herbicides (e.g., Trichloroacetic acid derivatives)
• Pharmaceuticals: Intermediate for hypnotic drugs
• Dye Manufacturing: Chlorination agent for organic compounds

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