[C:1]1(=[O:7])[O:6][C:4](=[O:5])[CH2:3][CH2:2]1.[C:8]1([S:14][CH3:15])[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1.[Cl-].[Cl-].[Cl-].[Al+3].Cl>ClCC(Cl)(Cl)Cl>[CH3:15][S:14][C:8]1[CH:13]=[CH:12][C:11]([C:1](=[O:7])[CH2:2][CH2:3][C:4]([OH:6])=[O:5])=[CH:10][CH:9]=1Succinic anhydride (17 g, 170 mmol) is added to a solution of thioanisole (20 ml, 170 mmol) in 140 ml of tetrachloroethane and the reaction mixture is then brought to 0° C. Aluminium trichloride (45.43 g, 341 mmol) is added in portions and the reaction mixture is then heated at 60° C. for 3.00 hours. After cooling and hydrolysis in the presence of ice-cold water (500 ml) and concentrated hydrochloric acid (50 ml), the white precipitate formed is filtered off, rinsed with water and recrystallised from ethyl acetate to yield the desired acid.
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