1-Naphthylamine
Agrochemicals 2025-03-02
1-Naphthylamine
Chemical Name: 1-Naphthylamine; α-Naphthylamine
Synonyms: 1-Aminonaphthalene; alpha-Naphthylamine
CAS Number: 134-32-7
Molecular Formula: C₁₀H₉N
Molecular Weight: 143.19 g/mol
Physical and Chemical Properties
- Appearance: White to reddish crystalline solid (turns purple/black on air exposure)
- Odor: Slight aromatic amine odor
- Melting Point: 50 °C (122 °F)
- Boiling Point: 300 °C (572 °F)
- Density: 1.13 g/cm³ (at 20 °C)
- Vapor Pressure: 0.001 mmHg (at 25 °C)
- Solubility:
- Slightly soluble in water (0.17 g/L at 20 °C).
- Soluble in ethanol, ether, benzene.
Chemical Properties
- Reactivity:
- Forms salts with acids (e.g., hydrochloride).
- Oxidizes in air (darkens over time).
- Reacts with nitrous acid to form carcinogenic diazonium compounds.
- Stability: Light-sensitive; store under inert atmosphere.
Hazard and Safety Information (GHS)
- Hazard Symbols: H351 (Suspected carcinogen), H410 (Very toxic to aquatic life)
- Hazard Statements:
- H302: Harmful if swallowed.
- H351: Suspected of causing cancer (Group 2B, IARC).
- H410: Very toxic to aquatic life with long-lasting effects.
- Precautionary Measures:
- P201: Obtain special instructions before use.
- P281: Use personal protective equipment.
- P308+P313: IF exposed or concerned: Get medical advice.
Storage & Handling
- Store in amber glass bottles under nitrogen/argon to prevent oxidation.
- Keep away from light, heat, and oxidizing agents.
- Use gloves (nitrile), lab coat, and fume hood (potential carcinogen).
Applications
- Dye intermediate (azo dyes, pigments).
- Rubber antioxidant production.
- Research chemical (historically used in pesticide synthesis).
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