Trimethyloxonium tetrafluoroborate

Trimethyloxonium tetrafluoroborate
Names
IUPAC name
Trimethyloxonium tetrafluoroborate
Other names
Meerwein's salt
Trimethyloxonium fluoroborate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.006.360
UNII
  • InChI=1S/C3H9O.BF4/c1-4(2)3;2-1(3,4)5/h1-3H3;/q+1;-1
    Key: CZVZBKHWOFJNCR-UHFFFAOYSA-N
  • F[B-](F)(F)F.[O+](C)(C)C
Properties
[(CH3)3O]+[BF4]−
Molar mass 147.91 g·mol−1
Appearance White solid
Melting point 179.6–180 °C (355.3–356.0 °F; 452.8–453.1 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Trimethyloxonium tetrafluoroborate is the organic compound with the formula [(CH3)3O]+[BF4]−. (It is sometimes called "Meerwein's salt" after Hans Meerwein.) This salt is a strong methylating agent, being a synthetic equivalent of CH+3. It is a white solid that rapidly decomposes upon exposure to atmospheric moisture, although it is robust enough to be weighed quickly without inert atmosphere protection. Triethyloxonium tetrafluoroborate is a closely related compound.

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