1-Bromo-1,2,2-trifluoroethene → 3-(p-Chlorophenyl)-1,1,2-trifluoro-4-methyl-1-pentene

Temperatur

38 °C

A mixture of zinc dust (15.72 g) and bromotrifluoroethylene (48.34 g, 0.30 mol) in N,N-dimethylformamide is heated to 38° C. After stirring at 38° C. for several minutes, the reaction mixture temperature rises to 65° C. over 30 minutes. The reaction mixture is then stirred for 90 minutes and cooled to −5° C. Copper(I) bromide (34.5 g, 0.24 mol) is then added to the cooled mixture. The reaction mixture is stirred at room temperature for 1 hour, treated sequentially with 1-(1-bromo-2-methylpropyl)-4-chlorobenzene (18.56 g, 0.075 mol) and limonene (5 drops), stirred at 49° C. overnight, cooled, and diluted with saturated ammonium chloride solution (400 mL) and concentrated ammonia solution (100 mL). The resultant aqueous mixture is extracted with hexanes. The combined organic extracts are washed sequentially with water, 10% hydrochloric acid, water, saturated sodium hydrogen carbonate solution and water, dried over anhydrous sodium sulfate, and concentrated in vacuo to obtain an oil. Column chromatography of the oil using silica gel and hexanes gives the title product as an oil (5.54 g) which is identified by NMR spectral analyses.

1. stirringThe reaction mixture is then stirred for 90 minutes
2. temperaturecooled to −5° C
3. stirringThe reaction mixture is stirred at room temperature for 1 hour
4. stirringstirred at 49° C. overnight
5. temperaturecooled
6. extractionThe resultant aqueous mixture is extracted with hexanes
7. washThe combined organic extracts are washed sequentially with water, 10% hydrochloric acid, water, saturated sodium hydrogen carbonate solution and water
8. dry with materialdried over anhydrous sodium sulfate
9. concentrationconcentrated in vacuo
10. customto obtain an oil

ORD-Eintrag

ord-722f09a4294c445db5ba26aba3d52b84

Quelldatensatz

uspto-grants-2001_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06235754B1