Reaktion #53765

Reaktionsgleichung

fluorenone

sodium hydrogen sulfite

bromine

bromine

water

→

yellow solid

Ausbeute 92.9%

2-bromofluorenone

Ausbeute 92.9%

Lösungsmittel

toluene

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeequipped with a stirrer
2. 2
   workup.ADDITIONto mix
3. 3
   Filtrationwas filtered
4. 4
   Sonstigethus 365 g of a crude product was obtained
5. 5
   Waschenwas subsequently washed with water
6. 6
   SonstigeThe resulting organic liquid was dried
7. 7
   FiltrationAfter filtration
8. 8
   Einengenthe liquid was concentrated
9. 9
   Sonstigeto stand at 0° C., so that a yellow solid
10. 10
    Sonstigewas precipitated
11. 11
    FiltrationThe precipitate was filtered
12. 12
    Waschensubsequently washed with toluene
13. 13
    Sonstigeby drying

Vorschrift

In a three-liter flask having four openings equipped with a stirrer, a thermometer, a dropping funnel, and a reflux condenser, respectively, 256 g (1.4 mol) of fluorenone, 1 L of water, three drops of a surfactant, and five drops of sulfuric acid were placed and stirred to mix. By adding 250 g (1.6 mol) of bromine into the mixture, a reaction was started. After the reaction had been conducted at 50° C. for 12 hours, unreacted bromine was decomposed with an aqueous solution of sodium hydrogen sulfite. The reaction product, which was a dark yellow solid, was filtered and thus 365 g of a crude product was obtained. The crude product was dissolved in toluene and was subsequently washed with water and a sodium hydrogencarbonate aqueous solution. The resulting organic liquid was dried using anhydrous magnesium sulfate. After filtration, the liquid was concentrated and then allowed to stand at 0° C., so that a yellow solid was precipitated. The precipitate was filtered and subsequently washed with toluene, followed by drying. Thus, 339 g (1.3 mol, yield of 92%) of a yellow solid product was obtained. This product was subjected to gas chromatography and the purity of the product was 99.4%.

Quelle