Agrochemicals

Thioacetic Acid

Chemical Name: Ethanethioic acid
Synonyms: Thioacetic acid; Thiolacetic acid; Acetyl mercaptan
CAS Number: 507-09-5
Molecular Formula: C₂H₄OS (or CH₃COSH)
Molecular Weight: 76.11 g/mol

Physical and Chemical Properties

• Appearance: Colorless to pale yellow liquid
• Odor: Strong, pungent (resembling acetic acid with a sulfurous note)
• Melting Point: −17 °C (1.4 °F)
• Boiling Point: 93 °C (199 °F)
• Density: 1.07 g/cm³ (at 20 °C)
• Solubility:
  • Soluble in water (reacts slowly).
  • Miscible with ethanol, ether, and organic solvents.
• pKa: ~3.5 (weak acid, stronger than acetic acid due to thiol group).

Chemical Properties

• Reactivity:
  • Reacts with bases, oxidizing agents, and metals.
  • Decomposes to release hydrogen sulfide (H₂S) and acetic acid.
• Functional Groups: Thioester (–COSH) and thiol (–SH) characteristics.

Hazard and Safety Information (GHS)

• Hazard Symbols: C (Corrosive), Xi (Irritant)
• Risk Phrases:
  • R10: Flammable liquid.
  • R20/22: Harmful if inhaled or swallowed.
  • R34: Causes burns.
• Safety Phrases:
  • S26: In case of contact with eyes, rinse immediately.
  • S36/37/39: Wear protective gloves/clothing/eye/face protection.
  • S45: In case of accident, seek medical help.

Storage & Handling

• Store in a cool, dry, well-ventilated area away from oxidizers and bases.
• Use corrosion-resistant containers (glass, stainless steel, or PTFE-lined).
• Handle under fume hood due to pungent odor and toxicity.

Applications

• Organic synthesis (thioesterification agent).
• Pharmaceutical intermediates.
• Rubber vulcanization.

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