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584 g of pyrrolidine and 126.7 g of diethyl ketone are placed into a pear-shaped flask fitted with a Soxhlet attachment. In the Soxhlet there is contained 200 g of molecular sieve A4. The mixture is boiled for 170 hours at 150° C. bath temperature, and subsequently concentrated in a rotary evaporator. The residue obtained is distilled in a water-jet vacuum. There is obtained 142 g (70% of theory) of N-(3-pent-2-enyl)-pyrrolidine, b.p. 80° C./ 18 Torr. With the use of excess diethyl ketone, it is possible to attain a yield of 94%.

1. customfitted with a Soxhlet attachment
2. concentrationbath temperature, and subsequently concentrated in a rotary evaporator
3. customThe residue obtained
4. distillationis distilled in a water-jet vacuum