[Sn](Cl)(Cl)(Cl)Cl.[CH3:6][O:7][C:8]1[CH:12]=[CH:11][S:10][CH:9]=1.[CH3:13][O:14][C:15]1[CH:23]=[CH:22][C:18]([C:19](Cl)=[O:20])=[CH:17][CH:16]=1.Cl>ClCCl>[CH3:13][O:14][C:15]1[CH:23]=[CH:22][C:18]([C:19]([C:9]2[S:10][CH:11]=[CH:12][C:8]=2[O:7][CH3:6])=[O:20])=[CH:17][CH:16]=12.7 ml of tin tetrachloride were added to a solution of 2.3 g of 3-methoxy-thiophene and 3.4 g of 4-methoxybenzoyl chloride in 50 ml of dichloromethane while cooling in ice. The mixture was stirred at room temp. overnight. For workup, 75 ml of 2 hydrochloric acid were added and the mixture was extracted three times with dichloromethane. The combined organic phases were washed twice with each of 2 N sodium carbonate solution and water, and then the solvent was removed in vacuo, and the crude product was purified by column filtration (SiO2, ethyl acetate/n-heptane=1:2). The product with the molecular weight of 248.3 (C13H12O3S), MS (Cl): 249 (M+H+) was obtained.
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