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A mixture of 75 g (0.235 mol) of 1-(diphenylmethyl)-3-(methanesulphonyloxy)-azetidine, 47.1 g (0.254 mol) of potassium phthalimide and 800 ml of dimethylformamide was refluxed for 1½ hours, during which time a fine precipitate gradually settled out. After cooling the precipitate was filtered off and the solvent was evaporated off in vacuo, finally under a high vacuum. The colourless residue crystallised when left to stand. Yield: 78.0 g (90% of theoretical). Rf=0.95 (El N).

1. temperaturewas refluxed for 1½ hours, during which time a fine precipitate
2. temperatureAfter cooling the precipitate
3. filtrationwas filtered off
4. customthe solvent was evaporated off in vacuo, finally under a high vacuum
5. customThe colourless residue crystallised when
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