Lithium ethoxide (CAS 2388-07-0) is an alkali metal alkoxide with the chemical formula LiOCH2CH3. It appears as a white powder or crystalline chunks and is widely used in medicine, organic synthesis, catalysis, and advanced materials. Because it is a strong base, it participates in a broad range of reactions, from deprotonation and condensation to transesterification and thin-film deposition.
What Is Lithium Ethoxide?
Lithium ethoxide is the lithium salt of ethanol, formed by replacing the acidic proton of the hydroxyl group with a lithium cation. As an alkoxide, it is strongly basic and nucleophilic, which makes it a valuable reagent for generating carbanions, enolates, and other reactive intermediates in organic chemistry. It is commercially available as a white powder with a purity of 99% or higher and is typically handled under anhydrous conditions because it reacts readily with moisture.
Chemical and Physical Properties
| Property | Value |
|---|---|
| Chemical formula | LiOCH2CH3 |
| CAS number | 2388-07-0 |
| Appearance | White powder and chunks |
| Purity | 99% or higher |
| Solubility | Soluble in ethanol and other alcohols; insoluble in non-polar organic solvents |
| Reactivity | Strong base; reacts with water and carbon dioxide |
| Thermal stability | Stable at moderate temperatures; avoid prolonged exposure to high heat |
Lithium ethoxide has an ionic, crystalline structure. It is non-volatile, shows high thermal stability when protected from moisture, and is insoluble in non-polar solvents such as hexane and toluene, which is a practical advantage when separation of reaction products is required.
Main Uses of Lithium Ethoxide
Organic synthesis: acts as a strong base in deprotonation and condensation reactions and is commonly applied in alkylation, acylation, and transesterification processes.
Pharmaceutical industry: used in the production of active pharmaceutical ingredients and other fine chemical intermediates.
Catalyst and polymer industry: serves as a catalyst in various polymerization reactions and in the preparation of specialty polymers and resins.
Advanced materials and research: used in lithium-based material development, including coatings, surface treatments, and as a precursor for chemical vapor deposition of thin films for lithium-ion battery electrolyte materials.
Phase-transfer and related applications: supports reactions that require a strong, soluble base in alcoholic media.
Handling and Storage Considerations
Lithium ethoxide is moisture-sensitive and reacts vigorously with water, releasing ethanol and heat, so it must be stored in airtight containers under an inert atmosphere such as nitrogen or argon. It is also alkaline and can cause skin and eye irritation, so personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing should be worn when handling it. Work areas should be dry, well-ventilated, and equipped with eyewash and safety shower facilities. In case of contact, rinse the affected area thoroughly with water and seek medical attention if irritation persists.
Frequently Asked Questions
What are the main applications of lithium ethoxide powder?
Lithium ethoxide powder is primarily used in organic synthesis, including the preparation of lithium-based compounds; as a catalyst in various chemical reactions; in the production of pharmaceuticals and specialty chemicals; and in the manufacture of lithium-containing materials for industrial applications.
What are the key properties of lithium ethoxide?
Key properties include a non-volatile crystalline structure, insolubility in non-polar organic solvents, high thermal stability when protected from moisture, and an ionic nature that makes it reactive in specific chemical processes.
Is lithium ethoxide soluble in organic solvents?
Lithium ethoxide dissolves well in alcohols such as ethanol and methanol, which are commonly used as reaction media. It is essentially insoluble in non-polar organic solvents like hexane and toluene, which can be useful for product isolation and purification.
How should lithium ethoxide be stored?
Store lithium ethoxide in tightly sealed containers under an inert gas atmosphere, in a cool and dry place away from moisture, acids, and oxidizing agents. Always reseal the container immediately after use to prevent hydrolysis and carbonation.
What industries use lithium ethoxide?
Lithium ethoxide is used in chemical manufacturing, pharmaceuticals, specialty chemicals, polymer production, and research and development in organic synthesis and lithium battery materials.
