Boron trifluoride etherate
Introduction

**Boron trifluoride etherate**, strictly **boron trifluoride diethyl etherate**, or boron trifluoride–ether complex, is the [chemical compound](/wiki/Chemical_compound "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](/wiki/Boron_trifluoride "Boron trifluoride") in many chemical reactions that require a [Lewis acid](/wiki/Lewis_acid "Lewis acid"). The compound features tetrahedral boron coordinated to a diethylether ligand. Many analogues are known, including the methanol complex.


How is boron trifluoride obtained from boron trifluoride etherate?