[Cl:1][C:2]1[CH:3]=[C:4]([NH:9][C:10](=[O:12])[CH3:11])[CH:5]=[C:6]([CH3:8])[CH:7]=1.[C:13](Cl)(=[O:15])[CH3:14].[Cl-].[Al+3].[Cl-].[Cl-]>C(=S)=S>[C:13]([C:7]1[C:6]([CH3:8])=[CH:5][C:4]([NH:9][C:10](=[O:12])[CH3:11])=[CH:3][C:2]=1[Cl:1])(=[O:15])[CH3:14]A dry CS2 solution (30 mL) containing N-(3-chloro-5-methyl-phenyl)acetamide (5.0 g, 27 mmol) and acetyl chloride (2.9 ml, 40.8 mmol) was slowly added with aluminum chloride (9.1 g, 68 mmol). The reaction mixture was heated at reflux for 30 min, cooled to room temperature, and stand for 4.0 h. The CS2 was decanted and the remaining syrup was poured into icy HCl. The resultant solids were collected, re-dissolved in EtOH, and decolorized by charcoal. The solution was filtered and the filtrate was concentrated under vacuum to give N-(4-acetyl-3-chloro-5-methylphenyl)acetamide (5.2 g) as light yellow solids in 85% yield: 1H NMR (500 MHz, CDCl3) δ 7.48 (s, 1H), 7.26 (s, 1H), 7.21 (s, 1H), 2.52 (s, 3H), 2.24 (s, 3 μl), 2.18 (s, 3H).
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