[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH3:8].Cl[C:10]([CH3:18])([CH2:12][CH2:13][C:14](Cl)([CH3:16])[CH3:15])[CH3:11].[Cl-].[Al+3].[Cl-].[Cl-].Cl>ClCCl>[F:1][C:2]1[C:3]([CH3:8])=[CH:4][C:5]2[C:14]([CH3:16])([CH3:15])[CH2:13][CH2:12][C:10]([CH3:18])([CH3:11])[C:6]=2[CH:7]=1To a solution of 15 g (136 mmol) of 2-fluorotoluene and 24.9 g (136 mmol) of 2,5-dichloro-2,5-dimethylhexane in 120 mL dichloromethane was added 1.82 g (13.6 mmol) of aluminum chloride and the solution heated at reflux. After 18 hours the reaction mixture was cooled to room temperature and 5% aqueous HCl was added. This was partitioned between hexane and water. The aqueous phase was washed once with hexane. The combined organic layers were washed with brine, dried over anhydrous sodium sulfate, and concentrated in vacuo to afford 25.8 g (86%) of 2-fluoro-3-methyl-5 ,5 ,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalene (m.p.=90.0-91.8° C.).
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