Date published: 2026-4-19

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Triethylphosphine oxide (CAS 597-50-2)

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CAS Number:
597-50-2
Molecular Weight:
134.16
Molecular Formula:
(C2H5)3PO
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

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Triethylphosphine oxide (TEPO) is an organophosphorus compound with a high reactivity, making it a staple reagent in the synthesis of various organic molecules such as amines, alcohols, and ethers. Its utility in organic synthesis is attributed to its ability to create a stable five-membered ring structure known as a phosphazene. Triethylphosphine oxide′s versatility extends to its role as a catalyst in several reactions, including alcohol oxidation, ester hydrolysis, and the condensation of aldehydes and ketones. Furthermore, it is instrumental in preparing other organophosphorus compounds, including phosphonates and phosphonamides. The compound′s reactivity is further explained by the two lone pairs of electrons on the phosphorus atom, which facilitate the formation of phosphonium salts when Triethylphosphine oxide interacts with alkyl halides. This interaction displaces the halide and ultimately leads back to the formation of Triethylphosphine oxide.


Triethylphosphine oxide (CAS 597-50-2) References

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  2. The competition of C-X⋯O=P halogen bond and π-hole⋯O=P bond between halopentafluorobenzenes C₆F₅X (X=F, Cl, Br, I) and triethylphosphine oxide.  |  Zhao, XR., et al. 2013. J Mol Model. 19: 5007-14. PMID: 24068308
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Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

Triethylphosphine oxide, 1 g

sc-237308
1 g
$94.00