Lithium Difluoroacetate: Properties, Handling & Lab Use Guide

Lithium difluoroacetate is a fluorinated lithium carboxylate salt widely used as a synthetic building block and ionic species source in organofluorine chemistry research.

Chemical Name

Lithium difluoroacetate

Synonyms

Lithium 2,2-difluoroacetate; difluoroacetic acid lithium salt

Molecular Formula

C₂HF₂LiO₂

CAS Number

Needs review — not confirmed in source material

Appearance

Typically a white crystalline solid (needs verification)

Solubility

Expected to be soluble in water and polar solvents; confirm with SDS

Aladdin SKU

L355087B

Chemical Identity and Physical Properties

Lithium difluoroacetate (also written as lithium 2,2-difluoroacetate) is the lithium salt of difluoroacetic acid (CHF₂COOH). Its molecular formula is C₂HF₂LiO₂. The compound belongs to the class of gem-difluorinated carboxylate salts, a subgroup of organofluorine chemicals that has attracted significant interest in medicinal chemistry, materials science, and synthetic methodology due to the unique electronic and steric properties conferred by the two fluorine substituents on the alpha carbon.

In its typical form, lithium difluoroacetate is expected to be a white crystalline or powdery solid. The presence of two electronegative fluorine atoms substantially lowers the pKa of the parent difluoroacetic acid compared with acetic acid, making the difluoroacetate anion a weaker nucleophile but a stable, well-defined counterion. The lithium cation is small and highly charge-dense, which can influence ion-pairing behaviour and solubility in polar solvents. Researchers should consult the product specification sheet and Safety Data Sheet (SDS) supplied by Aladdin Scientific for confirmed values of molecular weight, melting point, purity, and water content.

Note: Specific numerical physicochemical constants (e.g., exact melting point, density) are not confirmed in the available source material and have been flagged for review.

Research Applications

Lithium difluoroacetate serves several roles in chemical research and development:

• Synthetic building block: The difluoroacetate anion can act as a source of the –CHF₂ (difluoromethyl) or –CF₂COO⁻ fragment in metal-mediated or radical fluorination strategies. Organofluorine motifs are prized in drug discovery because fluorine substitution can modulate lipophilicity, metabolic stability, and membrane permeability of candidate molecules.
• Electrolyte additive research: Lithium carboxylate salts, including fluorinated variants, have been investigated as additives or co-salts in lithium-ion battery electrolyte formulations to improve interfacial stability and cycling performance. Lithium difluoroacetate may be of interest in this context due to the electron-withdrawing character of the difluoromethyl group.
• Reference standard and analytical use: High-purity fluorinated salts are employed as calibration standards or internal references in ¹H, ¹⁹F, and ⁷Li NMR spectroscopy experiments.
• Ion chemistry studies: The compound provides a defined source of the difluoroacetate anion for mechanistic studies of fluorinated carboxylate reactivity, ion-pair equilibria, or coordination chemistry with metal centres.

Note: Application claims beyond those supported by general organofluorine literature should be verified against primary research literature before use.

Safe Handling, Storage and Waste Disposal

General precautions: Although lithium difluoroacetate is a salt rather than the free difluoroacetic acid, researchers should treat it with appropriate caution. Difluoroacetate salts may release difluoroacetic acid vapour upon contact with strong acids or in aqueous solution at low pH. Difluoroacetic acid is corrosive and can cause skin, eye, and respiratory irritation. Always consult the current SDS before use.

Personal protective equipment (PPE): Wear chemically resistant gloves (nitrile or neoprene), a laboratory coat, and safety goggles when handling the compound. For operations likely to generate dust or aerosols, use a certified fume hood and consider respiratory protection appropriate to the exposure level.

Storage: Store in a tightly sealed container in a cool, dry, well-ventilated location, away from strong acids, oxidising agents, and moisture. Typical storage at room temperature or under refrigeration is expected for this class of compound; confirm with the Aladdin product specification sheet.

Incompatibilities: Avoid contact with strong mineral acids (which may liberate difluoroacetic acid), strong oxidisers, and reactive metals.

Waste disposal: Dispose of waste containing lithium difluoroacetate in accordance with local, national, and institutional regulations governing fluorine-containing chemical waste. Do not pour solutions down the drain without prior treatment or authorisation. Contact your institution's environmental health and safety (EHS) office for guidance.

Note: All safety information should be verified against the current Aladdin SDS for L355087B before laboratory use.

Quality, Purity and Specification Considerations

For research applications, the purity of lithium difluoroacetate is an important parameter, particularly in synthetic chemistry where trace impurities can affect reaction selectivity or yield, and in analytical applications where reference-grade material is required.

Typical quality considerations for this class of reagent include:

• Assay purity: Expressed as weight percent by titration or ion chromatography. Researchers should confirm the stated purity on the Aladdin Certificate of Analysis (CoA) for the specific lot being used.
• Water content: Lithium salts can be hygroscopic. Karl Fischer titration data on the CoA indicates the water content, which is relevant for reactions sensitive to moisture.
• Fluoride ion impurity: Incomplete synthesis or degradation may leave free fluoride ion (F⁻), which is a significant concern in biological assays and some catalytic applications. Check the CoA for this parameter.
• Heavy metals: For applications in biological or pharmaceutical research, confirm that heavy metal content is within acceptable limits.

Aladdin Scientific's product L355087B (Santa Cruz cross-reference sc-286138) is intended for research use only and is not approved for use in diagnostic or therapeutic procedures. Always request and review the CoA for the specific lot number received.

Ordering and Regulatory Information

Aladdin Scientific SKU: L355087B. This product carries the Santa Cruz cross-reference number sc-286138, which may assist researchers transitioning from another supplier or searching legacy literature.

Intended use: For research use only (RUO). Not for human or veterinary diagnostic or therapeutic use.

Regulatory considerations: Fluorinated acetate compounds vary in their regulatory status depending on jurisdiction. Researchers and procurement officers should verify import/export requirements and any controlled-substance classifications applicable in their country before ordering. Difluoroacetate is distinct from monofluoroacetate (which is a listed toxic compound in many jurisdictions); however, confirm local regulations with your institution's compliance officer.

Quantity and packaging: Available quantities and packaging formats are listed on the Aladdin Scientific product page for L355087B. Contact Aladdin's customer service for bulk pricing, custom packaging, or purity specifications beyond the standard catalogue offering.

Returns and quality issues: If the product does not meet the stated specifications, contact Aladdin Scientific customer service with the lot number and CoA within the applicable returns window. Refer to Aladdin's returns and refunds policy for full details.

Frequently asked questions

What is lithium difluoroacetate used for in the laboratory?

Lithium difluoroacetate is primarily used as a fluorinated building block in organofluorine synthesis, where the difluoroacetate moiety introduces gem-difluoro functionality into target molecules. It may also be investigated as an electrolyte additive in battery research and as an NMR reference standard or analytical reagent.

How should lithium difluoroacetate be stored to maintain stability?

Store lithium difluoroacetate in a tightly sealed container in a cool, dry, and well-ventilated area, away from moisture, strong acids, and oxidising agents. Because lithium salts may be hygroscopic, minimise exposure to atmospheric humidity during weighing and handling. Confirm specific storage conditions on the Aladdin CoA for lot L355087B.

Is lithium difluoroacetate the same as lithium fluoroacetate (lithium monofluoroacetate)?

No. Lithium difluoroacetate (CHF₂COOLi) has two fluorine atoms on the alpha carbon, while lithium monofluoroacetate (CH₂FCOOLi) has only one. These are distinct chemical compounds with different properties and regulatory status. Lithium monofluoroacetate is a well-known highly toxic substance listed as a controlled compound in many countries; lithium difluoroacetate is a separate entity and should not be confused with it.

How do I confirm the purity of the lithium difluoroacetate I receive?

Request the Certificate of Analysis (CoA) for the specific lot number from Aladdin Scientific. The CoA will detail assay purity, water content (Karl Fischer), and any other quality parameters tested. For critical applications, you may wish to perform independent verification by ion chromatography or ¹⁹F NMR spectroscopy.

What safety precautions are required when handling lithium difluoroacetate?

Wear appropriate PPE including nitrile gloves, safety goggles, and a laboratory coat. Handle in a well-ventilated fume hood, especially when generating dust. Avoid contact with strong acids that could liberate corrosive difluoroacetic acid vapour. Always consult the current SDS for L355087B before use.

References

1. Aladdin Scientific product page for Lithium difluoroacetate, SKU L355087B.
2. Santa Cruz Biotechnology cross-reference sc-286138 for lithium difluoroacetate.
3. Purser S, Moore PR, Swallow S, Gouverneur V. Fluorine in medicinal chemistry. Chem Soc Rev. 2008;37(2):320-330. doi:10.1039/b610213c
4. O'Hagan D. Understanding organofluorine chemistry. An introduction to the C-F bond. Chem Soc Rev. 2008;37(2):308-319. doi:10.1039/b711844a

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.