Malononitrile → [(5-Chloro-2-Thenoyl)Methyl]Malononitrile

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A solution of 2-bromo-1-(5-chloro-2-thienyl)ethanone (11.50 g, 48 mmol) in tetrahydrofuran is added to a solution of malononitrile (3.17 g, 48 mmol) and potassium tert-butoxide (5.70 g, 51 mmol) in tetrahydrofuran at 0° C. The reaction mixture is stirred for several minutes, concentrated in vacuo, diluted with water and filtered to collect solids. Flash chromatography of the solids using silica gel and a (4:1) hexane/ethyl acetate solution gives the title compound as a yellow solid, mp 155°-158° C.

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