Triethyloxonium tetrafluoroborate is the
organic oxonium compound with the formula [(CH
3CH
2)
3O]BF
4. It is often called
Meerwein's Reagent after its discoverer
Hans Meerwein. Also well known and commercially available is the related
trimethyloxonium tetrafluoroborate. The compounds are white solids that dissolve in polar organic solvents. They are strong
alkylating agents. Aside from the
BF4- salt, many related derivatives are available.