Boron trifluoride → 1-(4-(Trifluoromethoxy)phenyl)ethan-1-one

Into a 250 ml stainless steel reactor equipped with a magnetic stirrer system, 100 ml of anhydrous HF, 23.6 g (0.3 mole) of acetyl chloride, and 32.4 g (0.2 mole) of trifluoromethoxybenzene were introduced at around 0° C. The reactor was closed and gaseous boron trifluoride (BF3) introduced until a constant pressure of 6 bars was achieved. The reaction was then allowed to proceed with stirring at ambient temperature for 3 hours. Following reaction, the reactor was decompressed to atmospheric pressure, then the reaction mixture poured over 200 g of crushed ice. The resultant heterogeneous mixture was extracted three times with 200 ml of methylene chloride. The organic phases were washed three times with 200 ml of water, once with 200 ml of 3% aqueous potassium hydroxide solution, and twice with 200 ml of water. The organic phase was dried over magnesium sulfate and the solvent eliminated by distillation under reduced pressure. 37.2 g (yield: 91%) of p-trifluoromethoxyacetophenone having a purity of 96.3% was recovered.

1. additionwere introduced at around 0° C
2. customThe reactor was closed
3. customreaction
4. extractionThe resultant heterogeneous mixture was extracted three times with 200 ml of methylene chloride
5. washThe organic phases were washed three times with 200 ml of water
6. dry with materialThe organic phase was dried over magnesium sulfate
7. distillationthe solvent eliminated by distillation under reduced pressure

ORD-Eintrag

ord-ce50eaf66010467ba035d0935710f823

Quelldatensatz

uspto-grants-1984_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US04446078