Agrochemicals

Indole (CAS No. 120-72-9) 

1. Basic Information

• Chemical Name: Indole
• Synonyms: 1H-Indole; 2,3-Benzopyrrole
• CAS Number: 120-72-9
• Molecular Formula: C₈H₇N
• Molecular Weight: 117.15 g/mol
• Appearance: White to light yellow crystalline solid
• Odor: Intense fecal odor at high concentrations; floral at low dilutions

2. Physical and Chemical Properties

• Melting Point: 52–54 °C (126–129 °F)
• Boiling Point: 253–254 °C (487–489 °F)
• Density: 1.22 g/cm³ (at 20 °C)
• Solubility:
  • Water: Slightly soluble (~3.56 g/L at 25 °C)
  • Organic solvents: Soluble in ethanol, ether, benzene, chloroform
• pKa: ~16.2 (weakly basic)
• Flash Point: 121 °C (closed cup)
• Vapor Pressure: 0.01 mmHg at 20 °C

3. Hazards (GHS Classification)

• Health Hazards:
  • Eye/Skin: Causes irritation (H315, H319)
  • Inhalation/Ingestion: May cause respiratory/digestive tract irritation (H335, H302)
• Environmental Hazards: Toxic to aquatic life (H411)
• NFPA Rating: Health 2, Flammability 1, Reactivity 0

4. Storage and Handling

• Storage: Keep in a cool, dark place (light-sensitive) away from oxidizers.
• Handling: Use PPE (gloves, goggles) and work under fume hood.

5. Applications

• Fragrance industry: Component of jasmine and orange blossom scents.
• Pharmaceuticals: Precursor for tryptophan, indole alkaloids.
• Agrochemicals: Intermediate in pesticide synthesis.

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