Reaktion #65219

Reaktionsgleichung

ethanol

5-(3,5-di-tert-butyl-4-hydroxybenzoyl)-6-methoxyindan

boron tribromide dichloromethane

→

5-(3,5-di -tert-butyl-4-hydroxybenzoyl)-6-hydroxyindan

Ausbeute 83.6%

Lösungsmittel

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturcooling
2. 2
   workup.STIRRINGThe mixture was stirred under ice-
3. 3
   Temperaturcooling for 15 minutes
4. 4
   WaschenThe mixture was then washed with water
5. 5
   Trocknendried (MgSO4)
6. 6
   workup.DISTILLATIONthe solvent was distilled off
7. 7
   workup.ADDITIONTo the residue was added hexane

Vorschrift

To a solution of 5-(3,5-di-tert-butyl-4-hydroxybenzoyl)-6-methoxyindan (3.8 g) in dichloromethane (30 ml) was added boron tribromide-dichloromethane (1:2, 3 ml) dropwise with ice-cooling and stirring. The mixture was stirred under ice-cooling for 15 minutes, after which ethanol (5 ml) was added dropwise. The mixture was then washed with water and dried (MgSO4) and the solvent was distilled off. To the residue was added hexane to give crystals of 5-(3,5-di -tert-butyl-4-hydroxybenzoyl)-6-hydroxyindan (3.06 g, 83.6% ) . Recrystallization from ethanol gave light yellow prisms, m.p. 155°-156° C.

Quelle