Triethyl borate
Triethyl borate (CAS: 150-46-9), also known as Boron ethoxide, is a clear, colourless liquid with a molecular weight of 145.99 g/mol. It is primarily utilised as a chemical intermediate and reagent in various synthetic organic chemistry applications. Its properties make it valuable for introducing boron moieties into organic molecules, playing a role in the preparation of boronic acids and esters, which are crucial building blocks in pharmaceutical and material science research.
- IUPAC
- Boric acid triethyl ester,Boron ethoxide,Triethoxyborane
- Synonyms
- Boric acid triethyl esterBoron ethoxideTriethoxyborane

Boronic Acid and Ester Synthesis
Triethyl borate serves as a key reagent for the synthesis of boronic acids and esters. These compounds are widely employed in Suzuki-Miyaura cross-coupling reactions, a fundamental tool for carbon-carbon bond formation in drug discovery and fine chemical manufacturing.
Organometallic Reagent
As an organoborate, it functions as an organometallic reagent. This capability allows for its use in various reactions where the controlled introduction of a boron atom is required, facilitating the creation of complex organic structures.
Chemical Synthesis Intermediate
Its reactive nature makes triethyl borate a versatile intermediate in broader chemical synthesis. It is employed in the production of various organic compounds where boron incorporation is a necessary step.
| Molecular weight | 145.99 |
|---|---|
| Linear formula | (C2H5O)3B |
| Assay | 99% |
| Form | liquid |
| Boiling point | 117-118 °C(lit.) |
| Density | 0.858 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.374(lit.) |
| Vapour density | 5.04 (vs air) |

Hazard statements
- H225Highly flammable liquid and vapour
Precautionary statements
- P210Keep away from heat, sparks and open flames. No smoking
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 11 °C / 51.8 °F |
| Transport (UN / ADR) | UN 1176 3 / PGII |
| Water hazard class (WGK, DE) | 2 |
| Hazard codes (EU) | F |
| Risk statements (R) | 11 |
| Safety statements (S) | 7-16-23 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
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 Triethyl borate used for?
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Triethyl borate is primarily used as a reagent and intermediate in organic synthesis, particularly for the preparation of boronic acids and esters which are important in cross-coupling reactions, and as a general organoborate reagent.
What is the CAS number and formula for Triethyl borate?
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The CAS number for Triethyl borate is 150-46-9, and its linear formula is (C2H5O)3B.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Triethyl borate with an assay of 99%. This product is not represented as USP, BP, EP, or any other pharmacopoeia grade.
How should Triethyl borate be handled safely?
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Triethyl borate is a flammable liquid (H225) and requires careful handling. Use appropriate personal protective equipment including eyeshields, gloves, and a suitable respirator. Store away from ignition sources and in a well-ventilated area.
Is Triethyl borate a controlled substance?
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The provided data does not indicate that Triethyl borate is a controlled substance.
How is Triethyl borate shipped and exported by TSS?
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Tech Serve Solutions is a global supplier and exporter of chemicals, adhering to all relevant shipping and export regulations for hazardous materials like Triethyl borate (UN 1176).
How can I request a quote or sample of Triethyl borate?
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To request a quote or sample of Triethyl borate, please contact our sales team through the website or direct inquiry channels.
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