Reaktion #1733

Reaktionsgleichung

2-hexyl-9,9-dimethyl-6,7,8,9-tetrahydro-5H-benzocycloheptene

Br2

→

2-bromo-3-hexyl-5,5-dimethyl-6,7,8,9-tetrahydro-5H-benzocycloheptene

Lösungsmittel

CH2Cl2

CH2Cl2

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONthe mixture was poured on to ice
2. 2
   Extraktionextracted with diethyl ether
3. 3
   Waschenwashed with bisulphite solution and NaCl soln
4. 4
   Trocknen, dried over Na2SO4
5. 5
   Sonstigeevaporated to dryness

Vorschrift

This 3.08 g of 2-hexyl-9,9-dimethyl-6,7,8,9-tetrahydro-5H-benzocycloheptene were dissolved in 35 ml of CH2Cl2, treated at 0° with a spatula tip of Fe powder and then reacted with a solution of 0.67 ml of Br2 (1.1 eq.) in 5 ml of CH2Cl2. After 30 min., the mixture was poured on to ice, extracted with diethyl ether, washed with bisulphite solution and NaCl soln., dried over Na2SO4 and evaporated to dryness. Flash chromatography on SiO2 (hexane) gave 3.21 g of 2-bromo-3-hexyl-5,5-dimethyl-6,7,8,9-tetrahydro-5H-benzocycloheptene as a colorless oil (GC purity: 82%, moreover 2% ed., 2.6% regioisomer, 8.3% dibromo compound and further prod.).

Quelle