Agrochemicals

Butyryl Chloride (CAS No. 141-75-3) 

1. Basic Information

• Chemical Name: Butyryl chloride
• Synonyms: Butanoyl chloride; n-Butyryl chloride
• CAS Number: 141-75-3
• Molecular Formula: C₄H₇ClO
• Molecular Weight: 106.55 g/mol
• Appearance: Colorless to pale yellow liquid
• Odor: Pungent, irritating odor (similar to hydrochloric acid)
• Odor Threshold: <1 ppm

2. Physical and Chemical Properties

• Melting Point: -89°C (-128°F)
• Boiling Point: 101-102°C (214-216°F)
• Density: 1.028 g/cm³ at 20°C
• Refractive Index: 1.412 at 20°C
• Solubility:
  • Reacts violently with water and alcohols
  • Soluble in ether, acetone, benzene
• Vapor Pressure: 30 mmHg at 20°C
• Flash Point: 12°C (54°F) – Highly Flammable

3. Chemical Structure

   O  
  ║  
CH₃-CH₂-CH₂-C-Cl

4. Hazards (GHS Classification)

• Flammability: Highly flammable liquid and vapor (H225)
• Health Hazards:
  • Causes severe skin burns (H314)
  • Causes serious eye damage (H318)
  • Harmful if inhaled (H332)
• Environmental Hazards: Toxic to aquatic life (H402)
• NFPA Rating: Health 3, Flammability 2, Reactivity 1

5. Storage and Handling

• Storage:
  • Store under nitrogen/argon in a cool, dry place (<25°C)
  • Keep away from moisture, heat, and oxidizers
• Handling:
  • Use chemical-resistant gloves (neoprene/Viton®)
  • Wear goggles + face shield
  • Work in a fume hood with adequate ventilation

6. Applications

• Pharmaceuticals: Intermediate for drug synthesis (e.g., local anesthetics)
• Agrochemicals: Production of herbicides and pesticides
• Perfumery: Synthesis of butyrate esters (fruity flavors)

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