Sodium Methoxide Powder

Cas Number


Other Names

Sodium methylate

The formula



Sodium methoxide is a chemical compound with the formula CH3ONa. This colorless solid, which is formed by the deprotonation of methanol, is a widely used reagent in industry and the laboratory. It is also a dangerously caustic base.

Physical and Chemical Properties
Physical state and appearance White powder
Molecular Weight 54.03 g/mole
Odor Pungent odor.
Flash point 32 °C
Melting Point > 149°C (> 300°F)
Specific Gravity 1.1 (Water = 1)
Vapor Density 1.1 (Air = 1)
Dispersion Properties See solubility in water, methanol
Solubility Decomposed by water
Content (total Alkali) 99.0% min
Sodium Methoxide (NaOCH3) 97.0% min
Free Alkali 1.5% max
Na2CO3 0.3% max
Moisture 0.65% max

It is used in organic synthesis is applicable to the synthesis of numerous compounds ranging from pharmaceuticals to agrichemicals.

Sodium methoxide is used as an initiator of anionic addition polymerization with ethylene oxide, forming a polyether with high molecular weight.