反应详情

Tetrafluoroboric acid (250 ml, 2.00 mol) was added to cool (0° C.) pyridine (157.7 ml, 1.95 mol) within 25 mins. resulting in a colorless precipitate. After the acid was completely added, the mixture was further stirred for 30 mins. and held at the same temperature. Thereafter, the reaction mixture was filtered. The residue was washed twice with cold ethanol and dried for 12 hrs at high vacuum to yield 201.9 g (60%) of pyridiniumtetrafluoroborate in the form of colorless crystals.

1. customresulting in a colorless precipitate
2. additionAfter the acid was completely added
3. filtrationThereafter, the reaction mixture was filtered
4. washThe residue was washed twice with cold ethanol
5. customdried for 12 hrs at high vacuum