Reaktion #320787

Reaktionsgleichung

4-bromo-2,3-dihydro-2,2-dimethylbenzofuran

potassium persulfate

→

4-bromo-2,3-dihydro-2,2-dimethyl-3-benzofuranone

Ausbeute 67.0%

Lösungsmittel

water

acetonitrile

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturat reflux for one hour
2. 2
   ExtraktionThe mixture is then extracted with one 200 mL portion of diethyl ether
3. 3
   TrocknenThe extract is dried with magnesium sulfate
4. 4
   Filtrationfiltered
5. 5
   EinengenThe filtrate is concentrated under reduced pressure to a residual oil
6. 6
   WaschenElution
7. 7
   Einengenconcentrated under reduced pressure

Vorschrift

Under a nitrogen atmosphere, a stirred solution of 3.0 grams (0.013 mole) 4-bromo-2,3-dihydro-2,2-dimethylbenzofuran, 10.7 grams (0.039 mole) of potassium persulfate, and 3.3 grams (0.013 mole) of copper(II) sulfate pentahydrate in 30 mL of water and 30 mL of acetonitrile is heated at reflux for one hour. After this time the reaction mixture is poured into 200 mL of water. The mixture is then extracted with one 200 mL portion of diethyl ether. The extract is dried with magnesium sulfate and filtered. The filtrate is concentrated under reduced pressure to a residual oil. The oil is subjected to column chromatography on silica gel. Elution is accomplished using 1:1 petroleum ether and methylene chloride. The product-containing fractions are combined and concentrated under reduced pressure, yielding 2.1 grams of 4-bromo-2,3-dihydro-2,2-dimethyl-3-benzofuranone. The NMR spectrum is consistent with the proposed structure.

Quelle