Tetrafluoroboric acid → Triethylmethylphosphonium tetrafluoroborate

Temperature

28 °C

To 1,581.5 g (0.859 mole) of 8.92 weight percent triethylmethylphosphonium hydroxide aqueous solution prepared as above, 180.45 g (0.863 mole) of 42% fluoroboric acid was added. The resulting transparent and colorless solution was stirred at a room temperature of 28° C. for 1 hour. The solution was concentrated using a rotary evaporator under a reduced pressure to obtain 406.2 g of slurry. The slurry was cooled at 15° C. for about 2 hours, and was filtered to recover white crystals (189.63 g). The crystals were dried at 110° C. overnight to yield 168.40 g of triethylmethylphosphonium tetrafluoroborate. The Br ion concentration determined by silver nitrate titration was 4 ppm.

1. additionwas added
2. concentrationThe solution was concentrated
3. customa rotary evaporator under a reduced pressure
4. customto obtain 406.2 g of slurry
5. temperatureThe slurry was cooled at 15° C. for about 2 hours
6. filtrationwas filtered
7. customto recover white crystals (189.63 g)
8. customThe crystals were dried at 110° C. overnight

ORD record

ord-2a73703c41ef44949d8fd63e7a771a1e

Source dataset

uspto-grants-2003_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06649728B2