Indole CAS No.120-72-9

Indole (CAS No. 120-72-9) 

1. Basic Information

Chemical Name: IndoleSynonyms: 1H-Indole; 2,3-BenzopyrroleCAS Number: 120-72-9Molecular Formula: C₈H₇NMolecular Weight: 117.15 g/molAppearance: White to light yellow crystalline solidOdor: 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, chloroformpKa: ~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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