C(O[C:5](=[O:7])[CH3:6])(=O)C.C([C:11]1[CH:17]=[CH:16][CH:15]=[CH:14][C:12]=1[NH2:13])(C)C.[CH:18]1[CH:23]=CC=C[CH:19]=1>>[CH:18]([CH2:6][C:5]([NH:13][C:12]1[CH:14]=[CH:15][CH:16]=[CH:17][CH:11]=1)=[O:7])([CH3:23])[CH3:19]86 g of acetic acid anhydride were added to a solution of 108 g of 2-isopropyl-aniline and 250 ml of benzene and another 86 g of acetic acid anhydride were added thereto. The mixture was stirred at 20° C. for 16 hours and was washed with water, with aqueous sodium bicarbonate, with water, dried and evaporated to dryness under reduced pressure. The residue was triturated with hexane, cooled and filtered. The product was washed with hexane and dried under reduced pressure to obtain 115 g of 2-isopropylacetanilide melting at 67°-68° C.
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