Borane → 2,3,5,6-Tetrafluoro-p-xylene

To a stirred solution of perfluoroterephthalic acid (1.0 g, 4.2 mmol) in anhydrous THF (10 ml) under an atmosphere of dry argon was added Borane. THF complex (1.0M solution in THF, 10 equivalents, 42 ml) dropwise, and the mixture stirred at room temperature overnight. The solution was evaporated under reduced pressure to give a colourless oil and the excess Borane destroyed by addition of anhydrous methanol (40 ml) and evaporation (repeated three times). The residue was treated with 5% aqueous hydrocMoric acid then the pH of the mixture was adjusted to pH9 with 1N aqueous sodium hydroxide solution and extracted with dichloromethane (3×50 ml). The combined organic extracts were dried (MgSO4) and evaporated to give 2,3,5,6-tetrafluoro-p-xylene-∝,∝′-diol (0.75 g, 86%) as a white solid. This was used without further purification.

1. customThe solution was evaporated under reduced pressure
2. customto give a colourless oil
3. customthe excess Borane destroyed by addition of anhydrous methanol (40 ml) and evaporation (repeated three times)
4. additionThe residue was treated with 5% aqueous hydrocMoric acid
5. extractionextracted with dichloromethane (3×50 ml)
6. dry with materialThe combined organic extracts were dried (MgSO4)
7. customevaporated

ORD record

ord-ea4a61a4656b435d925210838f101324

Source dataset

uspto-grants-2011_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

USRE042152E1