Sodium Thiomethoxide

CAS No.: 5188-07-8 | EC No.: 225-969-9

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1. Chemical Identification

Property	Specification
IUPAC Name	Sodium methanethiolate
Molecular Formula	CH₃NaS
Molecular Weight	70.09 g/mol
Appearance	White to off-white powder
Density	1.12 g/cm³ at 20°C
Vapor Pressure	29 hPa at 25°C
Water Solubility	Soluble
pH	Strongly alkaline (12-14)

Synonyms:
Sodium methyl mercaptide, Sodium methanethiolate

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2. Key Applications

Chemical Synthesis

• Nucleophilic Substitution:
  ✓ Production of methyl aryl sulfides
  ✓ SN2 dealkylation of esters/ethers

Industrial Manufacturing

• Pesticides:
  ✓ Methomyl insecticide synthesis
  ✓ Other thioether pesticides
• Pharmaceuticals:
  ✓ Methionine production
  ✓ Sulfur-containing drug intermediates

Specialty Chemistry

• Dye intermediate
• Polymer modification agent

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3. Product Advantages

✔ Strong Nucleophilicity – High reactivity in substitution reactions
✔ Versatile Intermediate – Multiple industrial applications
✔ Controlled Reactivity – Predictable reaction kinetics

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4. Physical & Chemical Properties

• Thermal Stability:
  • Stable at room temperature
  • Decomposes at >250°C
• Reactivity:
  • Reacts violently with water/acid
  • Air-sensitive (store under inert gas)

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5. Handling & Storage

Parameter	Requirement
Storage Temp	2-8°C (under nitrogen/argon)
Packaging	25kg sealed metal drums
Shelf Life	12 months
Special Notes	Moisture-sensitive

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6. Safety Information

Danger!

• H314: Causes severe skin burns and eye damage
• H290: May be corrosive to metals
• H335: May cause respiratory irritation

Protective Measures:

• P280: Wear chemical-resistant gloves/face shield
• P303+P361+P353: Skin contact wash procedure
• P305+P351+P338: Eye contact rinse protocol

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7. Quality Specifications

• Purity: ≥95% (titration)
• Sulfur Content: 44-46%
• Water Content: ≤0.5%

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