Reaction #42267

Reaction equation

3-tert-butyl-1-methyl-6,6-di(4-chloro-phenyl)fulvene

fluorene

hydrochloric acid

n-butyl lithium hexane

→

aimed compound

(3-tert-butyl-5-methyl-cyclopentadienyl)(fluorenyl)di(4-chloro-phenyl)methane

Solvents

diethyl ether

diethyl ether

Conditions

Workup

1. 1
   OtherIn a 200 ml three-necked flask equipped with a magnetic stirrer chip and three-way cock
2. 2
   workup.STIRRINGstirred
3. 3
   Temperatureunder reflux for several days
4. 4
   Otherset in an ice bath
5. 5
   workup.STIRRINGstirred briefly
6. 6
   Otherto separate an organic phase
7. 7
   WashThe organic phase was washed with a saturated sodium bicarbonate aqueous solution, water and saturated brine
8. 8
   DryingThe organic phase was dried with anhydrous magnesium sulfate
9. 9
   Filtrationthe drying agent was filtered off
10. 10
    workup.DISTILLATIONthe solvent was distilled off from the filtrate under reduced pressure
11. 11
    Otherto give a red solid
12. 12
    OtherThe solid was purified with a column chromatography
13. 13
    workup.DISTILLATIONthe developing solvent was distilled off under reduced pressure
14. 14
    OtherThereafter, the remaining product was re-crystallized
15. 15
    Otherdried under reduced pressure

Procedure

In a 200 ml three-necked flask equipped with a magnetic stirrer chip and three-way cock thoroughly purged with nitrogen, 1.42 g of fluorene (8.52 mmol) was dissolved in 60 ml of dehydrated diethyl ether in a nitrogen atmosphere. To the solution, 5.6 ml of n-butyl lithium/hexane solution (1.58M: 8.85 mmol) was gradually added dropwise in an ice bath and stirred at room temperature over night. To the reaction solution, 2.99 g of 3-tert-butyl-1-methyl-6,6-di(4-chloro-phenyl)fulvene (8.08 mmol) was added and stirred under reflux for several days. The reaction mixture was gradually added dropwise to 30 ml of a hydrochloric acid aqueous solution (1N) set in an ice bath, and stirred briefly. Therein, diethyl ether was added to separate an organic phase. The organic phase was washed with a saturated sodium bicarbonate aqueous solution, water and saturated brine. The organic phase was dried with anhydrous magnesium sulfate, thereafter the drying agent was filtered off and the solvent was distilled off from the filtrate under reduced pressure to give a red solid. The solid was purified with a column chromatography using 180 g of silica gel (developing solvent: n-hexane) and the developing solvent was distilled off under reduced pressure. Thereafter, the remaining product was re-crystallized using hexane and dried under reduced pressure, and thereby the aimed compound was obtained in an amount of 1.69 g (3.16 mmol) as a pale yellow solid (yield: 39%).

Source