Chloroacetyl chloride → 1-(5-Acetyl-thiophen-2-yl)-2-chloro-ethanone

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General procedure described for compounds 1 and 2 starting from 2-acetylthiophene and chloroacetyl chloride. Purified by column chromatography column (hexane:ethyl acetate 3:1), yield 25%, m.p.: 94-95° C., 1H-NMR (CDCl3): δ8.3 (d, J=4.2 Hz, 1H, Ar), 8.1 (d, J=4.2 Hz, 1H, Ar), 4.55 (s, 2H, CH2), 2.6 (s, 3H, CH3); 13C-NMR (CDCl3). δ193.0 (CO), 187.8 (CO), 148.3 (C—CO), 142.0 (CH), 141.7 (C—CO), 133.7 (CH), 48.3 (CH2), 29.2 (CH3); M/z (EI): 204, 202 (M +, 4, 10%), 153 (M-CH2Cl, 100%); HPLC: Column μ Bondapack C18, 5 μm, 300 A, (300×3.9 mm), Purity 98%, r.t.=3.50 min, acetonitrile/H2O (0.05% H3PO4+0.04% Et3N) 50/50.

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