Reaction #11278

Reaction equation

HCl

9,9-dioctylfluorene

n-butyl lithium

dry-ice

→

required acid

9,9-Dioctyl-9H-fluorene-2-carboxylic Acid

Solvents

tetrahydrofuran

Conditions

Workup

1. 1
   OtherInto a flask fitted with a nitrogen inlet
2. 2
   workup.ADDITIONrubber septum were introduced 2-bromo
3. 3
   workup.ADDITIONthe reaction mixture was poured
4. 4
   workup.WAITleft
5. 5
   workup.WAITto stand overnight
6. 6
   Extractionextracted with chloroform
7. 7
   ExtractionThe chloroform extract
8. 8
   Washwas washed with water
9. 9
   Dryingdried over magnesium sulfate
10. 10
    Concentrationconcentrated

Procedure

Into a flask fitted with a nitrogen inlet and rubber septum were introduced 2-bromo,-9,9-dioctylfluorene (34.18 g, 72.8 mmole) and dry tetrahydrofuran (300 mL). The solution was cooled to −60° C. and n-butyl lithium (29.1 mL, 2.5M in hexanes, 72.8 mmole) added via a syringe. The reaction mixture was observed to turn red. After stirring for 1 hour at −60° C., the reaction mixture was poured onto powdered dry-ice and left to stand overnight. The mixture was acidified with 1M HCl and extracted with chloroform. The chloroform extract was washed with water, dried over magnesium sulfate and concentrated to give the required acid as an oil.

Source