[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH2:11][C:12]([OH:14])=O)[CH:6]=[CH:7][C:8]=1[O:9][CH3:10].S(Cl)([Cl:17])=O>C1C=CC=CC=1>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH2:11][C:12]([Cl:17])=[O:14])[CH:6]=[CH:7][C:8]=1[O:9][CH3:10]3,4-Dimethoxyphenylacetic acid (6.47 g, 0.033 mole) was dissolved in 50 ml of dry benzene and refluxed for 2 hr. with excess thionyl chloride (25 ml). The solvent and SOCl2 were removed on a rotary evaporator. Two additional quantities of dry benzene were added to the residue, followed by rotary evaporation which yielded 3,4-dimethoxyphenylacetyl chloride.
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