[Al+3].[Cl-].[Cl-].[Cl-].[C:5](Cl)([CH3:7])=[O:6].[CH2:9]([C:12]1[CH:17]=[CH:16][C:15]([O:18][CH3:19])=[CH:14][CH:13]=1)[CH2:10][CH3:11].Cl>ClCCl>[CH3:19][O:18][C:15]1[CH:16]=[CH:17][C:12]([CH2:9][CH2:10][CH3:11])=[CH:13][C:14]=1[C:5](=[O:6])[CH3:7]A suspension of 10.6 g of AlCl3 in 150 mL of dichloromethane is cooled to −10° C. 5.7 mL of AcCl and 6 g of 4-propylanisole are added. The medium is stirred for 30 minutes at −10° C. and then poured into a beaker containing ice mixed with 35% HCl. After separation of the phases by settling, the aqueous phase is extracted 3 times with DCM and the combined organic phases are washed with water, with saturated NaCl solution, dried over MgSO4 and then evaporated to give 7.86 g of a brown oil.
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