[C:1]([C:4]1[CH:14]=[C:13]([O:15][CH3:16])[CH:12]=[CH:11][C:5]=1[O:6][CH2:7]C(O)=O)(=O)[CH3:2].C(OC(=O)C)(=O)C.C(O)(=O)C>O>[CH3:16][O:15][C:13]1[CH:12]=[CH:11][C:5]2[O:6][CH:7]=[C:1]([CH3:2])[C:4]=2[CH:14]=1A mixture of (2-acetyl-4-methoxyphenoxy)acetic acid (10.0 g) synthesized above, acetic anhydride (18.3 g) and acetic acid (100 mL) was stirred at 110° C. for 5 hr, poured into water, and the mixture was extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogen carbonate solution and saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (5% ethyl acetate/hexane) to give the title object compound (5.87 g, 81%) as a colorless oil.
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