Reaktion #362814

Reaktionsgleichung

aluminum trichloride

isobutyl benzene

HCl

2-bromoisobutyryl bromide

→

1

Ausbeute 83.0%

(±)-2-Methyl-5-isobutyl-1-indanone

Ausbeute 83.0%

Lösungsmittel

methylene chloride

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe mixture was refluxed for 15 hours
2. 2
   workup.ADDITIONwere added
3. 3
   Extraktionthe mixture was extracted 3 times with 50 ml of diethyl ether in each case
4. 4
   WaschenThe combined organic phases were washed with 50 ml each of saturated aqueous NaHCO3 solution and NaCl solution
5. 5
   Trocknendried (MgSO4)
6. 6
   SonstigeAfter removal of the solvent
7. 7
   Sonstigeon a rotary evaporator
8. 8
   Sonstigethe crude product was chromatographed on 100 g of silica gel (hexane/methylene chloride 1:1)

Vorschrift

17.3 g (125 mmol) of aluminum trichloride were added with ice cooling to a solution of 6.7 g (50 mmol) of isobutyl benzene in 30 ml of methylene chloride. 11.9 g (52 mmol) of 2-bromoisobutyryl bromide were subsequently added rapidly, and the mixture was refluxed for 15 hours. The reaction mixture was poured into 100 ml of ice water, 25 ml of conc. aqueous HCl were added, and the mixture was extracted 3 times with 50 ml of diethyl ether in each case. The combined organic phases were washed with 50 ml each of saturated aqueous NaHCO3 solution and NaCl solution and dried (MgSO4). After removal of the solvent on a rotary evaporator, the crude product was chromatographed on 100 g of silica gel (hexane/methylene chloride 1:1), giving 8.4 g (83%) of 1 as a colorless oil.

Quelle