trans-1,4-Dibromo-2-butene → 2-(4-Bromobut-2-en-1-yl)isoindoline-1,3-dione

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A mixture of trans-1,4-dibromo-2-butene (6.4 g, 30 mmol) and potassium phthalimide (5.6 g, 30 mmol) in anhydrous dimethyl formamide (200 ml) was heated at 50° C. for 24 h. Then the reaction mixture was concentrated in vacuo, dissolved in ethyl acetate, washed with brine and the pure title product was obtained by flash chromatography on silica gel (ethyl acetate: hexane; 15:85) (3.2 g, 40%).

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