Tetrafluoroboric acid → Triethylmethylammonium Tetrafluoroborate

Participants

Reaction Steps

The reaction was carried out in the same manner as in Example 7 except for using in the second step 105 g (0.5 mol) of a 42% aqueous solution of tetrafluoroboric acid in place of the ethanol solution thereof, and 110 g (6.1 mol) of an aqueous solution of triethylmethylammonium 2-hydroxyisobutyrate in place of the ethanol solution thereof. No generation of gas due to by-production was observed, and the reaction liquid was homogeneous. The still residue after evaporation of the reaction liquid to dryness was recrystallized from ethanol and vacuum dried to obtain 89 g (0.44 mol) of triethylmethylammonium tetrafluoroborate. The purity was 99.0% by weight, the yield was 88.7 mol % based on triethylmethylammonium 2-hydroxyisobutyrate, and the moisture content of the crystal was 360 ppm.

Provenance & Evidence