[Cl-].[Cl-].[Cl-].[Al+3].ClCCl.Cl[C:9]([CH3:17])([CH2:11][CH2:12][C:13](Cl)([CH3:15])[CH3:14])[CH3:10].[C:18]1([OH:24])[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1>[Cl-].[Cl-].C>[CH3:10][C:9]1([CH3:17])[CH2:11][CH2:12][C:13]([CH3:15])([CH3:14])[C:22]2[CH:23]=[C:18]([OH:24])[CH:19]=[CH:20][C:21]1=2To a mixture of aluminum trichloride (3.0 g, 22.5 mmol), dichloromethane (50 ml) and 2,5-dichloro-2,5-dimethylhexane (15.0 g, 81.9 mmol) is added dropwise into a solution of phenol (7.7 g, 81.90 mmol) in 50 ml of methane dichloride, then the reaction mixture is heated for 4 hours at 35° C. After cooled, the reaction mixture is poured into ice (200 g) and extracted with ether (3×80 ml). The organic phase is washed with 10% NaHCO3 solution (2×150 ml), dried over MgSO4 and evaporated to give a crude product, which is crystallized from ethanol to give the title compound (15.20 g, 84%).
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