Diketene → 1-(1,3-Dioxobutyl)pyrrolidine

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A solution of 21 ml (0.25 mol) of pyrrolidine in 50 ml tetrahydrofuran was added dropwise to a solution of 20 g of diketene (0.24 mol) in 200 ml tetrahydrofuran at −5 to 0° C. After 1 h stirring at 0° C. no more starting material was detected by thin layer chromatography. The reaction mixture was evaporated and the residue was purified by column chromatography. This gave 29.9 g (0.19 mol, 81% yield) of an oil.

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