C1(C)C=C(C)C=C(C)C=1.[Cl-].[Al+3].[Cl-].[Cl-].[C:14]([C:17]1[CH:26]=[CH:25][C:24]2[C:19](=[CH:20][CH:21]=[C:22]([O:28][CH3:29])[C:23]=2Br)[CH:18]=1)(=[O:16])[CH3:15].BrC1C2C(=CC=CC=2)C=CC=1OC>>[C:14]([C:17]1[CH:26]=[CH:25][C:24]2[C:19](=[CH:20][CH:21]=[C:22]([O:28][CH3:29])[CH:23]=2)[CH:18]=1)(=[O:16])[CH3:15]51 Ml of mesitylene and 8.2 g of anhydrous aluminum chloride are added to the solution of 2-acetyl-5-bromo-6-methoxynaphthalene obtained as in example 1a), while keeping the temperature at -10° C. The reaction mixture is kept for 3 hours under stirring at 0° C. and then it is worked as in example 1 obtaining 43.2 g of product with a yield equal to 88.2% calculated on the basis of the starting material 1-bromo-2-methoxynaphthalene.
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