1,2-Dibromoethane → 1H-Isoindole-1,3(2H)-dione, 2-(2-bromoethyl)-

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Into a 500-mL round-bottom flask, was placed a solution of 1,2-dibromoethane (30 g, 159.57 mmol, 2.95 equiv) in N,N-dimethylformamide (200 mL). This was followed by the addition of potassium phthalimide (10 g, 54.05 mmol, 1.00 equiv) in several batches. The resulting solution was stirred for 24 h at 60° C. The reaction was then quenched by the addition of 500 mL of water. The resulting solution was extracted with 2×200 mL of ethyl acetate and the organic layers combined and dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was applied onto a silica gel column with ethyl acetate/petroleum ether (1:10). This resulted in 8 g (57%) of 2-(2-bromoethyl)isoindoline-1,3-dione as a white solid.

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