Potassium methoxide

CAS Number
865-33-8
EC Number
212-736-1

What is Potassium methoxide?

Potassium methoxide (CAS 865-33-8), also sold as potassium methylate or potassium methanolate, is a strong alkoxide base used primarily as a catalyst and reagent in industrial chemical synthesis.

Where is Potassium methoxide used?

  • Pharmaceutical manufacturing: drives condensation and cyclization to produce active pharmaceutical ingredients and intermediates
  • Biodiesel production: transesterification catalyst converting triglycerides into fatty acid methyl esters
  • Agrochemical synthesis: supports production of herbicides and pesticides
  • Polymer chemistry: initiates anionic polymerization
  • It also catalyzes the production of specialty polyesters and polyethers.

Good to know: Its high reactivity in non-aqueous systems suits processes requiring fast, selective reactions.

Commercial specifications

  • Solution in methanol, concentrations typically 25% to 32%
  • Dry powder or free-flowing solid for solvent-free handling
  • Packaging from drums to IBC totes

Other Names (Synonyms)

potassium methanolate|Potassium methylate|Methanol, potassium salt|45MYQ0GWGB|Methanol, potassium salt (1:1)|Methoxy potassium|RefChem:867893|Feldalat KM

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What are the physical properties of Potassium methoxide?

Melting Point -20°C
Boiling Point 84°C
Density 0.950 g/cm³
Flash Point 7°C
Appearance solid
Color Clear colorless
Form Liquid
Water Solubility may decompose
Vapor Pressure 0Pa at 25℃
Refractive Index n 20/D 1.37
pH 12.8 (7g/l, H2O, 20℃)

How is Potassium methoxide classified and handled safely? Learn More

Danger
GHS02· Flammable GHS05· Corrosive GHS07· Irritant

Hazard Statements

H228 H228
H251 H251
H302 H302
H314 H314
H318 H318

Precautionary Statements

P210 P210
P235 P235
P240 P240
P241 P241

Which trade and regulatory codes apply to Potassium methoxide?

HS Code 29051900
UN Number 3274
ADR Class 3
Packing Group II
WGK (Germany) 1
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