Cycloaddition of chiral carbodi-imides to prochiral ketens yields diastereoisomeric, non-racemic mixtures of 2-iminoazetidin-4-ones, the formation of one of the diastereoisomers being preferred; the composition of these mixtures was determined.
C. Bełżecki and Z. Krawczyk, J. Chem. Soc., Chem. Commun., 1977, 302 DOI: 10.1039/C39770000302
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