Dimethylformamide → 3,4,5-Trichlorothiophene-2-carbonyl chloride

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A mixture of 20.4 g (0.088 mole) of 3,4,5-trichloro-2-thiophenecarboxylic acid, 7.3 mL (0.1 mole) of thionyl chloride, 0.2 mL of DMF and 80 mL of 1,2-dichloroethane was heated at reflux temperature for 3 h. The reaction mixture became a clear solution after 1 h of heating. The mixture was allowed to cool to RT, concentrated in vacuo and exposed to high vacuum to give 22.0 g (>98% wt) an oil which solidified upon standing to an off-white powder, mp 37°-41° C.

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