[CH3:1][C:2]1[CH:3]=[C:4]([CH2:7][C:8]([OH:10])=[O:9])[S:5][CH:6]=1.[C:11](Cl)(=[O:18])[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1>>[CH3:1][C:2]1[CH:3]=[C:4]([CH2:7][C:8]([OH:10])=[O:9])[S:5][C:6]=1[C:11](=[O:18])[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1Using the procedure of Example 15, 6.65 gm of 4-methyl-thiophene-2-acetic acid and 5.96 gm of benzoyl chloride were reacted to obtain 4.87 gm of 4-methyl-5-benzoyl-thiophene-2-acetic acid melting at 86° C. The product occurred as a colorless solid soluble in benzene, ether, ethanol, chloroform and acetone and insoluble in water.
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