Reaktion #573544

Reaktionsgleichung

triisopropyl borate

1-bromo-3,4-difluorobenzene

magnesium

sulphuric acid

→

3,4-difluorophenylboric acid

Lösungsmittel

tetrahydrofuran

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwarmed to 14°-20° C.
2. 2
   workup.WAITleft
3. 3
   workup.WAITto stand overnight
4. 4
   Filtrationthe separated salt is filtered off
5. 5
   SonstigeThe aqueous phase of the filtrate is separated
6. 6
   Extraktionextracted with diethyl ether
7. 7
   Waschenwashed with sodium chloride solution
8. 8
   Trocknendried over sodium sulphate
9. 9
   Sonstigeevaporated

Vorschrift

A Grignard reagent solution prepared from 46.8 g of 1-bromo-3,4-difluorobenzene and 6 g of magnesium in 150 ml of tetrahydrofuran is added dropwise at -65° C. under nitrogen to a solution of 72.8 ml of triisopropyl borate in 200 ml of tetrahydrofuran. The mixture is stirred at -65° C. for 1 hour, warmed to 14°-20° C., treated dropwise with 100 ml of 10 percent (v/v) sulphuric acid, left to stand overnight and the separated salt is filtered off. The aqueous phase of the filtrate is separated and extracted with diethyl ether. The organic phases are combined, washed with sodium chloride solution, dried over sodium sulphate and evaporated. After boiling with hexane the residue gives 22.1 g of colourless 3,4-difluorophenylboric acid m.p. 275°-277.5° C. (sublimed).

Quelle