Reaktion #1353161

Reaktionsgleichung

sodium hydroxide

α-methylstyrene

bromoform

sodium hydroxide

→

2,2-dibromo-1-methyl-1-phenylcyclopropane

Ausbeute 86.3%

Lösungsmittel

water

—

hexanes

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added
2. 2
   TemperaturAfter 2 additional hours of heating
3. 3
   workup.ADDITIONwere added
4. 4
   SonstigeThe resulting mixture was transferred to a separatory funnel
5. 5
   Sonstigethe phases were separated
6. 6
   TrocknenThe organic layer was dried over MgSO4
7. 7
   Filtrationfiltered
8. 8
   SonstigeThe solvent was removed from the filtrate in vacuo
9. 9
   SonstigeThe product was isolated by vacuum distillation

Vorschrift

To a solution of 12.5 ml (0.0963 mol) of α-methylstyrene in 30.4 ml (0.348 mol) of bromoform and 1.34 g (0.00416 mol) of tetrabutylammonium bromide was added slowly via addition funnel 20.9 ml (0.400 mol) of 50% aqueous sodium hydroxide. After heating to 55° C. for 1 hour 20.9 ml (0.400 mol) of 50% aqueous sodium hydroxide was added. After 2 additional hours of heating, the reaction was cooled to room temperature when hexanes and water were added. The resulting mixture was transferred to a separatory funnel and the phases were separated. The organic layer was dried over MgSO4 and filtered. The solvent was removed from the filtrate in vacuo. The product was isolated by vacuum distillation to yield 24.1 g of 2,2-dibromo-1-methyl-1-phenylcyclopropane as an oil.

Quelle