Boron trifluoride etherate

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Boron trifluoride etherate
Boron trifluoride-diethyl etherate.svg
3D model (JSmol)
UN number 2604
Molar mass 141.93 g·mol−1
Appearance colorless liquid
Density 1.15 g cm–3
Boiling point 126 °C (259 °F; 399 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Boron trifluoride etherate, strictly boron trifluoride diethyl etherate, or boron trifluoride–ether complex, is the chemical compound with the formula BF3O(C2H5)2, often abbreviated BF3OEt2. It is a colorless liquid, although older samples can appear brown. The compound is used as a source of boron trifluoride in many chemical reactions that require a Lewis acid.[1] The compound features tetrahedral boron coordinated to a diethylether ligand.[2] Many analogues are known, including the methanol complex.


It serves as a source of boron trifluoride via the equilibrium:

BF3OEt2 BF3 + OEt2

The BF3 binds to even weak Lewis bases, inducing reactions of the resulting adducts with nucleophiles..[1]


  1. ^ a b Veronica Cornel; Carl J. Lovely (2007). "Boron Trifluoride Etherate". Encyclopedia of Reagents for Organic Synthesis. John Wiley & Sons. doi:10.1002/047084289X.rb249.pub2.
  2. ^ V. V. Saraev, P. B. Kraikivskii, I. Svoboda, A. S. Kuzakov, R. F. Jordan (2008). "Synthesis, Molecular Structure, and EPR Analysis of the Three-Coordinate Ni(I) Complex [Ni(PPh3)3][BF4]". J. Phys. Chem. A. 112: 12449–12455. doi:10.1021/jp802462x.