反应详情

温度

-10 °C

12.5 g of 4-(2,3',4',5'-tetrafluorobiphenyl-4-yl)cyclohexanone and 15.5 g of propyltriphenylphosphonium bromide were introduced into 150 ml of THF, and the mixture was cooled to -10° C. with stirring and under nitrogen. A solution of 4.5 g of potassium tert-butoxide in 150 ml of THF was then added dropwise with stirring at -10° C., and the mixture was then stirred at room temperature for a further 2 hours. The yellow suspension was then cooled to 10° C., and 200 ml of water were added. The organic phase was separated off, and the aqueous phase was extracted once with 100 ml of methyl tert-butyl ether. The combined organic extracts were washed once with 50 ml of water, dried using sodium sulfate, filtered and evaporated to a residue. The residue was purified by means of a silica-gel frit, and the eluate was evaporated to a residue, giving 3,4,5,2'-tetrafluoro-4'-(4-propylidenecyclohexyl)bi-phenyl.

1. stirringwith stirring at -10° C.
2. stirringthe mixture was then stirred at room temperature for a further 2 hours
3. temperatureThe yellow suspension was then cooled to 10° C.
4. customThe organic phase was separated off
5. extractionthe aqueous phase was extracted once with 100 ml of methyl tert-butyl ether
6. washThe combined organic extracts were washed once with 50 ml of water
7. customdried
8. filtrationfiltered
9. customevaporated to a residue
10. customThe residue was purified by means of a silica-gel frit
11. customthe eluate was evaporated to a residue