Réaction #1552055

Équation de réaction

p-dibromobenzene

carbazole

potassium carbonate

18-crown-6-ether

→

objective light brown plate-shaped crystal

Rendement 36.2%

9-(4-bromophenyl)carbazole

Rendement 36.2%

Solvants

N,N′-dimethylpropyleneurea

Conditions de réaction

Traitement

1. 1
   TempératureAfter the reaction mixture was cooled to room temperature
2. 2
   Autrea precipitate was removed by suction filtration
3. 3
   LavageThe filtrate washed with dilute hydrochloric acid
4. 4
   Séchagea saturated sodium hydrogen carbonate aqueous solution, and a saturated saline solution in this order and dried with magnesium sulfate
5. 5
   AutreAfter being dried
6. 6
   Filtrationthe solution was filtered naturally
7. 7
   Autrecondensed
8. 8
   Autrean obtained oily substance was purified by silica gel column chromatography (hexane:ethyl acetate=9:1)
9. 9
   Autrerecrystallized with chloroform and hexane

Mode opératoire

First, 56 g (240 mmol) of p-dibromobenzene, 31 g (180 mmol) of carbazole, 4.6 g (24 mmol) of copper iodide, 66 g (480 mmol) of potassium carbonate, and 2.1 g (8 mmol) of 18-crown-6-ether were put in a 300-mL three-neck flask, and nitrogen was substituted for air in the flask. Then, 8 mL of N,N′-dimethylpropyleneurea (abbreviation: DMPU) was added therein, and the mixture was stirred at 180° C. for 6 hours. After the reaction mixture was cooled to room temperature, a precipitate was removed by suction filtration. The filtrate washed with dilute hydrochloric acid, a saturated sodium hydrogen carbonate aqueous solution, and a saturated saline solution in this order and dried with magnesium sulfate. After being dried, the solution was filtered naturally and condensed, and an obtained oily substance was purified by silica gel column chromatography (hexane:ethyl acetate=9:1) and recrystallized with chloroform and hexane; thus, 21 g of an objective light brown plate-shaped crystal of 9-(4-bromophenyl)carbazole was obtained (yield: 35%).

Source