Agrochemicals

2-Mercapto-5-methoxybenzimidazole (CAS No. 37052-78-1) 

1. Basic Information

• Chemical Name: 2-Mercapto-5-methoxybenzimidazole
• Synonyms:
  • 5-Methoxy-1H-benzimidazole-2-thiol
  • 5-Methoxy-2-benzimidazolethiol
• CAS Number: 37052-78-1
• Molecular Formula: C₈H₈N₂OS
• Molecular Weight: 180.23 g/mol
• Appearance: White to off-white crystalline powder
• Odor: Mild sulfur-like odor

2. Physical and Chemical Properties

• Melting Point: ~280–285 °C (decomposes)
• Solubility:
  • Water: Slightly soluble
  • Organic solvents: Soluble in DMSO, methanol, ethanol; partially soluble in acetone
• pKa: ~8–10 (thiol group)
• Stability: Stable under normal conditions, but may decompose at high temperatures

3. Hazards (GHS Classification)

• Health Hazards:
  • Skin/Eye Irritation: May cause irritation (H315, H319)
  • Inhalation: Dust may cause respiratory irritation (H335)
  • Sensitization: Potential skin sensitizer (H317)
• Environmental Hazards: May be harmful to aquatic organisms (H412)
• NFPA Rating: Health 2, Flammability 1, Reactivity 0

4. Storage and Handling

• Storage: Store in a cool, dry place away from strong oxidizers and acids. Keep container tightly closed.
• Handling: Use PPE (gloves, safety goggles, lab coat) and handle in a well-ventilated area or fume hood.

5. Applications

• Pharmaceuticals: Intermediate in drug synthesis (e.g., antiparasitic agents).
• Corrosion inhibitors: Used in metal protection formulations.
• Organic synthesis: Building block for benzimidazole derivatives.

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