Reaktion #699906

Reaktionsgleichung

2-bromobenzene

2,5-dichloro-dimethyl hexane

HCl

AlCl3

AlCl3

→

2-bromo-5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalene

Ausbeute 73.4%

Lösungsmittel

CH2Cl2

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionextracted with CHCl3 (2×700 mL)
2. 2
   WaschenThe organic phase was washed with water, aqueous saturated NaHCO3, saturated NaCl
3. 3
   Trocknendried (Na2SO4)
4. 4
   EinengenThe organic solution was then concentrated in vacuo
5. 5
   Sonstigechromatographed (hexane)

Vorschrift

To a solution of 2-bromobenzene (40 g, 255 mmol) and 2,5-dichloro-dimethyl hexane (52.7 g, 280 mmol) in 600 mL anhydrous CH2Cl2 at 5° C. was added, portionwise, AlCl3 (10.2 g, 76 mmol). Upon addition of AlCl3, HCl gas evolution was observed. The solution changed from yellow to reddish orange. The reaction solution was kept at 5-20° C. for two hours and then allowed to stir at room temperature overnight. The reaction mixture was poured into 600 g of ice and extracted with CHCl3 (2×700 mL). The organic phase was washed with water, aqueous saturated NaHCO3, saturated NaCl and dried (Na2SO4). The organic solution was then concentrated in vacuo and chromatographed (hexane) to provide 50 g of 2-bromo-5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalene as a yellow gummy solid in 73% yield. 1H NMR (400 MHz, CDCl3) δ7.41 (d, J=2.0 Hz, 1H, aromatic), 7.22 (dd, J=8.0 and 1.9 Hz, 1H, aromatic), 7.18 (d, J=8.0 Hz, 1H, aromatic), 1.68 (s, 4H, 2CH2), 1.27 (s, 6H, 2CH3), 1.24 (s, 6H, 2CH3).

Quelle