Boron trifluoride diethyl etherate
Boron trifluoride diethyl etherate (CAS: 109-63-7), with the formula BF3 · O(C2H5)2 and a molecular weight of 141.93 g/mol, is a vital Lewis acid and a versatile reagent in organic synthesis. Supplied by Tech Serve Solutions as a brown liquid, this compound serves as a potent catalyst and a source of boron trifluoride in various chemical transformations, particularly in esterifications and polymerizations. Its complexation with diethyl ether stabilises BF3, making it easier to handle.
- IUPAC
- Boron trifluoride ethyl etherate

Lewis Acid Catalysis
Boron trifluoride diethyl etherate functions as a strong Lewis acid catalyst. It effectively promotes reactions such as esterification, Friedel-Crafts acylation, and polymerization, where it activates substrates by accepting electron pairs.
Boron Trifluoride Source
This complex serves as a convenient and stabilised source of boron trifluoride (BF3). It is often preferred over gaseous BF3 due to its liquid form, which simplifies handling and dosing in synthetic procedures.
Organic Synthesis Reagent
It is widely employed in organic chemistry for a variety of transformations, including the formation of ethers, acetals, and heterocyclic compounds. Its reactivity profile makes it a valuable tool for constructing complex molecular architectures.
Polymerization Initiator
Boron trifluoride diethyl etherate can initiate cationic polymerization reactions. It is particularly useful for polymerizing olefins and other monomers susceptible to cationic chain growth.
| Molecular weight | 141.93 |
|---|---|
| Linear formula | BF3 · O(C2H5)2 |
| Form | liquid |
| Colour | brown |
| Boiling point | 126-129 °C(lit.) |
| Density | 1.15 g/mL(lit.) |
| Refractive index | n20/D 1.344(lit.) |
| Melting point | −58 °C(lit.) |
| Vapour pressure | 4.2 mmHg (20 °C) |
| Vapour density | 4.9 (vs air) |
| Storage temperature | 2-8°C |




Hazard statements
- H226Flammable liquid and vapour
- H302Harmful if swallowed
- H314Causes severe skin burns and eye damage
- H330Fatal if inhaled
- H372Causes damage to organs through prolonged exposure
Precautionary statements
- P260Do not breathe dust, fume, gas, mist, vapours or spray
- P280Wear protective gloves, clothing and eye/face protection
- P284Wear respiratory protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Faceshields, full-face respirator (US), Gloves, Goggles, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 48 °C / 118.4 °F |
| Transport (UN / ADR) | UN 2604 3(8) / PGI |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T |
| Risk statements (R) | 10-14-22-23-35-48/23 |
| Safety statements (S) | 16-23-26-36/37/39-45 |
| Supplemental hazards | Reacts violently with water. |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Expl Lim | 36 % |
|---|
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Boron trifluoride diethyl etherate used for?
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Boron trifluoride diethyl etherate is primarily used as a Lewis acid catalyst and a stabilised source of boron trifluoride in organic synthesis, including esterifications, Friedel-Crafts reactions, and polymerizations.
What are the CAS number and formula for Boron trifluoride diethyl etherate?
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The CAS number is 109-63-7, and the formula is BF3 · O(C2H5)2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Boron trifluoride diethyl etherate typically as a technical or research grade. We do not represent this product as USP, BP, or EP grade unless explicitly stated in the product specifications.
How should Boron trifluoride diethyl etherate be handled safely?
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Boron trifluoride diethyl etherate is a danger to health and safety. It is flammable, harmful if swallowed, causes severe skin burns and eye damage, and is toxic if inhaled. It reacts violently with water. Always handle with appropriate personal protective equipment, including gloves, eye protection, and respiratory protection, in a well-ventilated area. Refer to the Safety Data Sheet for detailed handling information.
How is Boron trifluoride diethyl etherate packed, shipped, and exported?
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Boron trifluoride diethyl etherate is carefully packed in compliance with international shipping regulations for hazardous materials. Tech Serve Solutions is experienced in exporting chemicals globally.
How can I request a quote or sample?
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To request a quote or sample of Boron trifluoride diethyl etherate, please contact our sales team through the website or by phone, providing your specific requirements.
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